小数四则混合运算专项练习276题(有答案)ok

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小数混合运算专项练习276题(有答案)

(1) 0.11×1.8+8.2×0.11 (9) 1.8×[(3.41﹣2.9)÷0.03]

(2) 2.34×99+2.34 (3) 5.4÷2.7×0.8 (4) 132×101 (5) 6.25÷1.25÷0.8 (6) 2.5×16. (7) 6.33×101﹣6.33 (8) 1.56×1.7+0.44×1.7

小数混合运算--- 1

10) 0.125×32×2.5.

11) 1.258×18.5﹣0.258×18.5 12) 8.48÷0.8×0.9

13) 1.25×2.4

14) 5.85÷(1.3+0.5)×6.

15) 17.17﹣6.8﹣3.2﹣6.17

16) 5.4×[(1.3+2.15)÷0.2] ((

(((( (

(17) 8.4÷0.6+8.4÷0.4 (25) 83.7﹣12.83﹣0.17

(18) 16.8×10.1 (26) 5.96+13×(3.2﹣3.12)

(19) 10.9﹣0.9÷0.2+1.8 (20) 1.25×3.2×0.25. (21) 1.36+4.85+2.64+6.15 (22) 98.5÷2.5÷4 (23) 5.4÷[2.5×(3.7﹣2.9)] (24) 0.8×(4﹣3.68)÷0.01 小数混合运算--- (27) (28) (29) (30) (31) (32) 2

4.32÷2.4×1.7;

16.2×4.5+3.8×4.5;

9.05﹣3.86﹣3.14;

7.28+0.72÷0.9

4.32+5.43+6.68

17.17﹣6.8﹣3.2

(33) 5.29×9+5.29 (41) 15.68﹣(7.78﹣4.32)﹣2.32

(34) 16.8×10.1 (42) 0.25×3.2×1.25

(35) 2.74×9.5+5×0.274 (36) 0.36+9.6÷3.2. (37) 3.75×25+6.25×25 (38) 25.46﹣8.23﹣1.76 (39) 2.9+7.1×10 (40) 1.25×32×0.25. 小数混合运算--- (43) (44) (45) (46) (47) (48) 3

9.99×1.01

4.63×1.4+46.3×0.86

17.5÷0.8÷12.5

0.9+9.9+99.9+999.9.

2.9×99+2.9

25×11.2×4

(49) 23.25﹣6.75﹣3.25. (57) 35.6﹣5×1.73

(50) 125×3.2×2.5 (58) 1.6×55.4﹣55.4×0.6

(51) 3.6×10.1 (52) 5.8×2.7+0.58×73 (53) 3.6+6.4×1.8 (54) (1.48+3.02)÷(3.6×0.5) (55) (36.7﹣4.9)×101﹣31.8. (56) 6.33×101﹣6.33 小数混合运算--- (59) (60) (61) (62) (63) (64) 4

17.68÷5.2+2.7×1.5.

1.08×0.8÷0.27

102×0.45

22.78÷1.25÷0.8

0.34×101﹣0.34.

0.125×32×2.5

(65) 0.8×6.3﹣0.8×3.8 (73) 10.8﹣0.8÷(0.35+0.05)

(66) 504÷3.2×2.08 (74) 8×[1÷(2.3﹣2.25)]

(67) (20﹣0.8×9)×5.7 (68) 2.4×1.5+3.6÷1.5 (69) 7.38﹣5.14+3.62﹣2.86 (70) 0.12×1.8+8.2×0.12 (71) 5.4÷[0.51÷(1.2﹣1.03)] (72) [(8.1﹣5.6)×0.9﹣1.05]÷0.04. 小数混合运算--- (75) (76) (77) (78) (79) (80) 5

2.64×9.9+0.264

4.52+0.61+1.39+6.48

4.27﹣(1.96﹣1.73)

(294.4﹣19.2×6)÷(6+8)12.5×0.76×0.4×8×2.5.

4.98+8.02×2.5

(81) 60.8﹣40.8÷2.5 (89) 7.236÷0.18﹣14.3×0.02.

(82) 0.8×69.6×12.5 (90) 9.6÷0.4×0.25

(83) 4.98×99+4.9 (84) 6.48÷3.2÷2.5 (85) 1.2×7.6+7.6×6.8. (86) (9.4﹣5.8)×2.07 (87) 12.54﹣4.56﹣3.44﹣1.54 (88) (9.36×5+9.36+9.36×2)×1.25 小数混合运算--- (91) (92) (93) (94) (95) (96) 6

29.7÷(5.85÷0.65)

7.4×9.9

3.84﹣2.7×0.64

8.68﹣8.68÷0.56×0.5

4.7×4.7+4.7+4.3×4.7.

2.72÷[(8.2﹣6.5)×0.5];

(97) 9.12+9.12×9﹣60.2; (105) 11.87﹣(8.2+1.87)

(98) 28.4÷0.4÷0.25; (106) 5.42﹣3.87﹣1.13

(99) 27.36﹣27.36÷7.6. (100) 3.25×0.45+6.75×0.45 (101) 31.5﹣24.5÷3.5 (102) 7.5×102 (103) 6.3+3.7×2.8. (104) 2.15+8.73+1.27+7.85 小数混合运算--- (107)(108)(109)(110)(111)(112)7

4.38﹣1.56+0.62﹣0.44

0.4×270×2.

(40+1.25)×8

(12.5﹣0.05)×8

2.6×8.5+8.5×7.4

9.9×6.9﹣6.9×3.9

(113) 5.6×99+5.6 (121) 0.25×1.25×3.2

(114) 2.5×(1.9+1.9+1.9+1.9) (122) 6.4×14+15×6.4+6.4

(115) 7.2÷1.25÷8. (116) 52.4﹣(15+0.6)÷1.6 (117) 9.87×99+9.87 (118) 46.8÷0.9÷0.4 (119) 5.5×17.3+6.7×5.5. (120) 99×4.2+4.2 小数混合运算--- (123)(124)(125)(126)(127)(128)8

(1.3+1.3×0.125×8)÷(80﹣77.4)4×(25+2.5+0.25)÷111

6.25÷〔(17.2﹣3.6×4.5)÷0.32〕 28.4×99+28.4

0.94×2.5﹣0.45

4×0.8×12.5×2.5

(129) 17.5÷0.25×17+13. (137) 7.5﹣(5.5+1.24)

(130) 10.1×87 (138) 0.26+15.68+9.74+2.32

(131) 2.3+3.19÷(22﹣19.8) (132) 1.25×7.2. (133) 9.1﹣1.2÷6﹣6.24 (134) 7.3+12.8﹣3.8×2.3 (135) (5.36+7.64)÷13×100 (136) 7.575÷[(5.63﹣1.88)×0.2]. 小数混合运算--- (139)(140)(141)(142)(143)(144)9

13.26+9.55﹣3.26

6.1+3.9﹣6.1+3.9.

÷0.63(保留2位小数)×1.5+3.6÷1.5

×0.25+0.08÷4

(9.6+1.48÷3.7)÷8

31.7

2.4 0.32

(145) 5.8÷[4×(1.34﹣0.14)] (153) (45+14)÷73+710.

(146) 5.4÷[0.51÷(1.2﹣1.03)]. (154) 13.7×0.125×8

(147) 21.35﹣3.25﹣16.75 (148) 33.02﹣(148.4﹣90.85)÷2.5 (149) 32×2.5×0.125 (150) 18.1+(3﹣0.299÷0.23)×1. (151) 67﹣(2.98+0.67) (152) 8×16﹣73.8×6 小数混合运算--- (155) (156) (157) (158) (159) (160) 10

0.8×[13﹣(3.12+5.28)]

102×0.56

1.53×1.7+0.47×1.7.

5.18+0.73+0.82

0.75×1.8÷1.5

12.5×7.1×0.8

(240) 8.5×[(2.36+2.42)÷0.25] (248) 8×(20﹣1.25)

(241) 3.9÷[(1.3+0.6)×6﹣3.6] (249) 0.654+10.9×6.5

(242) 4.25×6.3+3.7×4.25 (243) 205×0.99 (244) 25.6﹣7.49﹣2.51 (245) [2.5﹣(6.8﹣4.9)]×0.8.(246) 102×4.5 (247) 3.4÷[(1.2+0.5)×5] 小数混合运算--- (250) (251) (252) (253) (254) (255) 16

22.7×1.25×0.8

3.91×2.8+6.09×2.8.6.23+3.09=

132.4﹣59.8=

6.62×0.84=

2.07÷0.023=

(256) [20.026﹣(8.6+9.7)×0.92]÷30.19. (264) 2.5×99+2.5;

(257) 0.125×32×2.5 (265) 10.36+4.8﹣16.5÷5;

(258) 0.8×6.3﹣0.8×3.8 (259) 50.4÷3.2×2.08 (260) 204÷(3.4×0.5) (261) (43.26+2.34)÷7.5 (262) (20﹣0.8×9)×5.7. (263) 13.25﹣0.8+1.75﹣1.2; 小数混合运算--- (266) (267) (268) (269) (270) (271) 17

12.5×2.4.

38.78﹣19.59+41.22﹣30.41

2.74×4.86+4.86×6.26+4.86

0.08×(12.5+2.5)×0.1

25.92+(10.1﹣14.5×0.2)

0.487×12.5÷48.7

(272) (8.16+2.09)÷[(10.3﹣9.3)÷0.4]. (275) 0.25×2010+20.10×75

(273) 1.56×1.7+0.44×1.7 (274) 12.5×(7.2﹣1.9)×0.8

小数混合运算---

(276) 30.8÷[(6.34﹣4.59)×4].

18

参考答案:

(1)0.11×1.8+8.2×0.11, =0.11×(1.8+8.2), =0.11×10, =1.1;

(2)2.34×99+2.34, =2.34×(99+1), =2.34×100, =234;

(3)5.4÷2.7×0.8, =2×0.8, =1.6;

(4)132×101, =132×(100+1), =132×100+132, =13332;

(5)6.25÷1.25÷0.8, =6.25÷(1.25×0.8), =6.25÷1, =6.25;

(6)2.5×16, =(2.5×4)×4, =40

(7)6.33×101﹣6.33, =6.33×(101﹣1), =6.33×100, =633;

(8)1.56×1.7+0.44×1.7, =1.7×(1.56+0.44), =1.7×2, =3.4;

(9)1.8×[(3.41﹣2.9)÷0.03], =1.8×[0.51÷0.03], =1.8×17, =30.6;

(10)0.125×32×2.5, =(0.125×8)×(4×2.5), =1×10, =10

(11)1.258×18.5﹣0.258×18.5,=18.5×(1.258﹣0.258), =18.5×1, =18.5;

(12)8.48÷0.8×0.9, =10.6×0.9, =9.54;

小数混合运算---

(13)1.25×2.4, =1.25×8×0.3, =10×0.3, =3;

(14)5.85÷(1.3+0.5)×6, =5.85÷1.8×6, =3.25×6, =19.5

(15)17.17﹣6.8﹣3.2﹣6.17 =(17.17﹣6.17)﹣(6.8+3.2), =11﹣10, =1;

(16)5.4×[(1.3+2.15)÷0.2] =5.4×[3.45÷0.2], =5.4×17.25, =93.15;

(17)8.4÷0.6+8.4÷0.4 =14+21 =35;

(18)16.8×10.1

=16.8×10+16.8×0.1, =168+1.68, =169.68;

(19)10.9﹣0.9÷0.2+1.8 =10.9﹣4.5+1.8, =8.2;

(20)1.25×3.2×0.25

=(1.25×0.8)×(4×0.25), =1×1, =1

(21)1.36+4.85+2.64+6.15, =(1.36+2.64)+(4.85+6.15), =4+11, =15;

(22)98.5÷2.5÷4, =98.5÷(2.5×4), =98.5÷10, =9.85;

(23)5.4÷[2.5×(3.7﹣2.9)],=5.4÷[2.5×0.8], =5.4÷2, =2.7;

(24)0.8×(4﹣3.68)÷0.01, =0.8×0.32÷0.01, =0.256÷0.01, =25.6;

19

(25)83.7﹣12.83﹣0.17, =83.7﹣(12.83+0.17), =83.7﹣13, =70.7;

(26)5.96+13×(3.2﹣3.12), =5.96+13×0.08, =5.96+1.04, =7.

(27)4.32÷2.4×1.7, =1.8×1.7, =3.06;

(28)16.2×4.5+3.8×4.5, =(16.2+3.8)×4.5, =20×4.5, =90;

(29)9.05﹣3.86﹣3.14, =9.05﹣(3.86+3.14), =9.05﹣7, =2.05;

(30)7.28+0.72÷0.9, =7.28+0.8, =8.08

(31)4.32+5.43+6.68, =4.32+6.68+5.43, =11+5.43, =16.43;

(32)17.17﹣6.8﹣3.2, =17.17﹣(6.8+3.2), =17.17﹣10, =7.17;

(33)5.29×9+5.29, =5.29×(9+1), =5.29×10, =52.9;

(34)16.8×10.1, =16.8×10+16.8×0.1, =168+1.68, =169.68;

(35)2.74×9.5+5×0.274, =2.74×9.5+0.5×2.74, =2.74×(9.5+0.5), =2.74×10, =27.4;

(36)0.36+9.6÷3.2, =0.36+3, =3.36

(37)3.75×25+6.25×25, =25×(3.75+6.25), =25×10,

小数混合运算---

=250;

(38)25.46﹣8.23﹣1.76, =25.46﹣(8.23+1.76), =25.46﹣9.99 =15.45;

(39)2.9+7.1×10, =2.9+71, =73.9;

(40)1.25×32×0.25 =(1.25×8)×(4×0.25), =10×1, =1.

(41)15.68﹣(7.78﹣4.32)﹣2.32, =15.68﹣7.78+4.32﹣2.32,

=(15.68+4.32)﹣(7.78+2.32), =20﹣10, =10;

(42)0.25×3.2×1.25, =0.25×4×0.8×1.25,

=(0.25×4)×(0.8×1.25), =1×1, =1;

(43)9.99×1.01, =(10﹣0.01)×1.01, =10.1﹣0.0101, =10.0899;

(44)4.63×1.4+46.3×0.86, =46.3×0.14+46.3×0.86, =46.3×(0.14+0.86), =46.3×1, =46.3;

(45)17.5÷0.8÷12.5, =17.5÷(0.8×12.5), =17.5÷1, =17.5;

(46)0.9+9.9+99.9+999.9,

=1﹣0.1+10﹣0.1+100﹣0.1+1000﹣0.1, =(1+10+100+1000)﹣(0.1+0.1+0.1+0.1),=1111﹣0.4, =1110.6

(47)2.9×99+2.9 =(99+1)×2.9, =100×2.9, =290;

(48)25×11.2×4 =25×4×11.2, =100×11.2, =1120;

(49)23.25﹣6.75﹣3.25

20

=23.25﹣(6.75+3.25), =23.25﹣10, =13.25

(50)125×3.2×2.5, =125×8×0.4×2.5,

=(125×8)×(0.4×2.5), =1000×1, =1000;

(51)3.6×10.1, =3.6×(10+0.1), =3.6×10+3.6×0.1, =36+0.36, =36.36;

(52)5.8×2.7+0.58×73, =5.8×2.7+5.8×7.3, =5.8×(2.7+7.3), =5.8×10, =58;

(53)3.6+6.4×1.8, =3.6+11.52, =15.12; (54)(1.48+3.02)÷(3.6×0.5),=4.5÷1.8, =2.5; (55)(36.7﹣4.9)×101﹣31.8, =31.8×101﹣31.8, =31.8×(101﹣1), =31.8×100, =3180

(56)6.33×101﹣6.33 =6.33×(101﹣1), =6.33×100, =633;

(57)35.6﹣5×1.73, =35.6﹣8.65, =26.95;

(58)1.6×55.4﹣55.4×0.6, =55.4×(1.6﹣0.6), =55.4×1, =55.4;

(59)17.68÷5.2+2.7×1.5, =3.4+4.05, =7.45

(60)1.08×0.8÷0.27 =1.08÷0.27×0.8, =4×0.8, =3.2;

(61)102×0.45 =(100+2)×0.45,

小数混合运算---

=100×0.45+2×0.45, =45+0.9, =45.9;

(62)22.78÷1.25÷0.8 =22.78÷(1.25×0.8), =22.78÷1, =22.78;

(63)0.34×101﹣0.34 =(101﹣1)×0.34, =100×0.34, =34

(64)0.125×32×2.5, =(0.125×8)×(4×2.5), =1×10, =10;

(65)0.8×6.3﹣0.8×3.8, =0.8×(6.3﹣3.8), =0.8×2.5, =2;

(66)504÷3.2×2.08, =157.5×2.08, =327.6; (67)(20﹣0.8×9)×5.7, =(20﹣7.2)×5.7, =12.8×5.7, =72.96

(68)2.4×1.5+3.6÷1.5, =3.6+2.4, =6;

(69)7.38﹣5.14+3.62﹣2.86, =(7.38+3.62)﹣(5.14+2.86), =11﹣8, =3;

(70)0.12×1.8+8.2×0.12, =0.12×(1.8+8.2), =0.12×10, =1.2;

(71)5.4÷[0.51÷(1.2﹣1.03)], =5.4÷[0.51÷0.17], =5.4÷3, =1.8;

(72)[(8.1﹣5.6)×0.9﹣1.05]÷0.04,=[2.5×0.9﹣1.05]÷0.04, =[2.25﹣1.05]÷0.04, =1.2÷0.04, =30

(73)10.8﹣0.8÷(0.35+0.05), =10.8﹣0.8÷0.4, =10.8﹣2,

21

=8.8;

(74)8×[1÷(2.3﹣2.25)], =8×[1÷0.05], =8×20, =160;

(75)2.64×9.9+0.264, =0.264×99+0.264, =0.264×(99+1), =0.264×100, =26.4;

(76)4.52+0.61+1.39+6.48 =(4.52+6.48)+(0.61+1.39), =11+2, =13;

(77)4.27﹣(1.96﹣1.73) =4.27﹣0.23, =4.04; (78)(294.4﹣19.2×6)÷(6+8) =(294.4﹣115.2)÷14, =179.2÷14, =12.8;

(79)12.5×0.76×0.4×8×2.5

=(12.5×8)×(0.4×2.5)×0.76, =100×1×0.76, =76.

(80)4.98+8.02×2.5, =4.98+20.25, =25.03;

(81)60.8﹣40.8÷2.5, =60.8﹣16.32, =44.48;

(82)0.8×69.6×12.5, =(0.8×12.5)×69.6, =10×69.6, =696;

(83)4.98×99+4.9, =493.02+4.9, =497.92;

(84)6.48÷3.2÷2.5, =6.48÷(3.2×2.5), =6.48÷8, =0.81;

(85)1.2×7.6+7.6×6.8, =7.6×(1.2+6.8), =7.6×8, =60.8 (86)(9.4﹣5.8)×2.07, =3.6×2.07,

小数混合运算---

=7.452;

(87)12.54﹣4.56﹣3.44﹣1.54, =(12.54﹣1.54)﹣(4.56+3.44), =11﹣8, =3;

(88)(9.36×5+9.36+9.36×2)×1.25, =9.36×(5+2+1)×1.25, =9.36×8×1.25, =9.36×(8×1.25), =93.6;

(89)7.236÷0.18﹣14.3×0.02, =40.2﹣0.286, =39.914.

(90)9.6÷0.4×0.25, =24×0.25, =6;

(91)29.7÷(5.85÷0.65), =29.7÷9, =3.3;

(92)7.4×9.9, =7.4×(10﹣0.1), =7.4×10﹣7.4×0.1, =74﹣0.74, =73.26;

(93)3.84﹣2.7×0.64, =3.84﹣1.728, =2.112;

(94)8.68﹣8.68÷0.56×0.5, =8.68﹣15.5×0.5, =8.68﹣7.75, =0.93;

(95)4.7×4.7+4.7+4.3×4.7, =4.7×(4.7+4.3+1), =4.7×10, =47

(96)2.72÷[(8.2﹣6.5)×0.5] =2.72÷[1.7×0.5], =2.72÷0.85, =3.2;

(97)9.12+9.12×9﹣60.2 =(1+9)×9.12﹣60.2, =10×9.12﹣60.2, =91.2﹣60.2, =31;

(98)28.4÷0.4÷0.25 =28.4÷(0.4×0.25), =28.4÷0.1, =284;

22

(99)27.36﹣27.36÷7.6 =27.6﹣3.6, =24

(100)3.25×0.45+6.75×0.45, =0.45×(3.25+6.75), =0.45×10, =4.5;

(101)31.5﹣24.5÷3.5, =31.5﹣7, =24.5;

(102)7.5×102, =7.5×(100+2), =7.5×100+7.5×2, =750+15, =765;

(103)6.3+3.7×2.8, =6.3+10.36, =16.66.

(104)2.15+8.73+1.27+7.85 =(2.15+7.85)+(8.73+1.27), =10+10, =20;

(105)11.87﹣(8.2+1.87), =11.87﹣1.87﹣8.2, =10﹣8.2, =1.8;

(106)5.42﹣3.87﹣1.13, =5.42﹣5, =0.42;

(107)4.38﹣1.56+0.62﹣0.44, =(4.38+0.62)﹣(1.56+0.44), =5﹣2, =3;

(108)0.4×270×2.5, =(0.4×2.5)×270, =270; (109)(40+1.25)×8, =40×8+1.25×8, =320+10, =330; (110)(12.5﹣0.05)×8, =12.5×8﹣0.05×8, =100﹣0.4, =99.6;

(111)2.6×8.5+8.5×7.4, =(2.6+7.4)×8.5, =85;

小数混合运算---

(112)9.9×6.9﹣6.9×3.9, =(9.9﹣3.9)×6.9, =6×6.9, =41.4;

(113)5.6×99+5.6, =5.6×(99+1), =560;

(114)2.5×(1.9+1.9+1.9+1.9), =2.5×4×1.9, =10×1.9, =19;

(115)7.2÷1.25÷8, =7.2÷8÷1.25, =0.9÷1.25, =0.72.

(116)52.4﹣(15+0.6)÷1.6, =52.4﹣15.6÷1.6, =52.4﹣9.75, =42.65;

(117)9.87×99+9.87, =9.87×(99+1), =987;

(118)46.8÷0.9÷0.4, =46.8÷(0.9×0.4), =46.8÷0.36, =130;

(119)5.5×17.3+6.7×5.5, =5.5×(17.3+6.7), =5.5×24, =132

(120)99×4.2+4.2 =4.2×(99+1), =4.2×100, =420;

(121)0.25×1.25×3.2 =0.25×1.25×(4×0.8), =0.25×4×(1.25×0.8), =1×1, =1;

(122)6.4×14+15×6.4+6.4 =6.4×(14+15+1), =6.4×30, =192; (123)(1.3+1.3×0.125×8)÷(80﹣77.4)=(1.3+1.3×1)÷2.6, =2.6÷2.6, =1;

(124)4×(25+2.5+0.25)÷111 =(4×25+4×2.5+4×0.25)÷111,

23

=(100+10+1)÷111, =111÷111, =1;

(125)6.25÷[(17.2﹣3.6×4.5)÷0.32] =6.25÷[(17.2﹣16.2)÷0.32], =6.25÷(1÷0.32), =6.25÷3.125, =2

(126)28.4×99+28.4, =28.4×(99+1), =28.4×100, =2840.

(127)0.94×2.5﹣0.45, =2.35﹣0.45, =1.9.

(128)4×0.8×12.5×2.5, =(4×2.5)×(0.8×12.5), =10×10, =100.

(129)17.5÷0.25×17+13, =70×17+13, =1190+13, =1203

(130)10.1×87, =(10+0.1)×87, =87+8.7, =95.7;

(131)2.3+3.19÷(22﹣19.8), =2.3+3.19÷2.2, =2.3+1.45, =3.75;

(132)1.25×7.2, =1.25×8×0.9, =10×0.9, =9

(133)9.1﹣1.2÷6﹣6.24 =9.1﹣0.2﹣6.24, =8.9﹣6.24, =2.66;

(134)7.3+12.8﹣3.8×2.3 =20.1﹣8.74, =11.36; (135)(5.36+7.64)÷13×100 =13÷13×100, =100;

(136)7.575÷[(5.63﹣1.88)×0.2] =7.575÷[3.75×0.2], =7.575÷0.75, =10.1

小数混合运算---

(137)7.5﹣(5.5+1.24), =7.5﹣5.5﹣1.24, =2﹣1.24, =0.76;

(138)0.26+15.68+9.74+2.32, =(0.26+9.74)+(15.68+2.32), =10+18, =28;

(139)13.26+9.55﹣3.26, =13.26﹣3.26+9.55, =10+9.55, =19.55;

(140)6.1+3.9﹣6.1+3.9, =6.1﹣6.1+(3.9+3.9), =0+7.8, =7.8

(141)31.7÷0.63≈50.32; (142)2.4×1.5+3.6÷1.5 =3.6+2.4, =6;

(143)0.32×0.25+0.08÷4 =0.08+0.08÷4, =0.08+0.02, =0.08+0.02, =0.1; (144)(9.6+1.48÷3.7)÷8 =(9.6+0.4)÷8, =10÷8, =1.25;

(145)5.8÷[4×(1.34﹣0.14)] =5.8÷[4×1.2], =5.8÷4.8, ≈1.21;

(146)5.4÷[0.51÷(1.2﹣1.03)] =5.4÷[0.51÷0.17], =5.4÷3, =1.8

(147)21.35﹣3.25﹣16.75, =21.35﹣(3.25+16.75), =21.35﹣20, =1.35;

(148)33.02﹣(148.4﹣90.85)÷2.5,=33.02﹣57.55÷2.5, =33.02﹣23.02, =10;

(149)32×2.5×0.125, =4×8×2.5×0.125,

=(4×2.5)×(8×0.125),

24

=10×1, =10;

(150)18.1+(3﹣0.299÷0.23)×1, =6.12×100,

=612;

(162)8.6÷0.86+8×0.35, =18.1+(3﹣1.3)×1, =18.1+1.7×1, =18.1+1.7, =19.8

(151)67﹣(2.98+0.67), =67﹣3.65, =63.35;

(152)8×16﹣73.8×6, =128+442.8, =570.8; (153)(45+14)÷73+710, =59÷73+710, =

+710, =710

(154)13.7×0.125×8, =13.7×(0.125×8), =13.7×1, =13.7;

(155)0.8×[13﹣(3.12+5.28)],=0.8×[13﹣8.4], =0.8×4.6, =3.68;

(156)102×0.56, =(100+2)×0.56, =100×0.56+2×0.56, =56+1.12, =57.12;

(157)1.53×1.7+0.47×1.7, =(1.53+0.47)×1.7, =2×1.7, =3.4

(158)5.18+0.73+0.82,. =(5.18+0.82)+0.73, =6+0.73, =6.73;

(159)0.75×1.8÷1.5, =1.35÷1.5, =0.9;

(160)12.5×7.1×0.8, =(12.5×0.8)×7.1, =10×7.1, =71;

(160)6.12×99+6.12, =6.12×(99+1),

小数混合运算---

=10+2.8, =12.8;

(163)5.6×(18.5﹣8.5÷0.5), =5.6×(18.5﹣17), =5.6×1.5, =8.4

(164)0.125×4.78×80, =0.125×4.78×8×10,

=(0.125×8)×(4.78×10), =1×47.8, =47.8;

(165)2.8×3.6+1.4×2.8, =2.8×(3.6+1.4), =2.8×5, =14; (166)(0.4+40)×2.5, =0.4×2.5+40×2.5, =1+100, =101;

(167)78.7﹣17.7×3.6, =78.7﹣63.72, =14.98;

(168)18÷[0.3×(8﹣6.5)], =18÷[0.3×1.5], =18÷0.45, =40;

(169)12.7+12.5+0.5, =12.7+(12.5+0.5), =12.7+13, =25.7

(170)91÷2.6÷0.05, =35÷0.05, =700;

(171)6.3×3.7+6.3×6.3, =6.3×(3.7+6.3), =6.3×10, =63; (172)(3.7+1.7×0.4)÷2.5, =(3.7+0.68)÷2.5, =4.38÷2.5, =1.752;

(173)7.28+3.2÷2.5, =7.28+1.28, =8.56;

(174)0.74+0.9×7.4,

25

=(1+9)×0.74, =10×0.74, =7.4;

(175)7.8÷0.125÷0.8, =7.8÷(0.125×0.8), =7.8÷0.1, =78

(176)37.5÷[0.3×(1.34﹣0.84)], =37.5÷[0.3×0.5], =37.5÷0.15, =250; (177)(2.5+27.75÷1.5)×1.6, =1×3.2, =3.2;

(187)14.5×102, =14.5×(100+2), =14.5×100+14.5×2, =1450+29, =1479;

(188)14.64+3.7×2.8, =14.64+10.36, =25;

(189)8.4÷0.21÷0.5, =40÷0.5, =(2.5+18.5)×1.6, =21×1.6, =33.6

(178)6.21﹣3.8+2.2, =2.41+2.2, =4.61;

(179)6.03+3.7+2.97, =(6.03+2.97)+3.7, =9+3.7, =12.7;

(180)17.43﹣6.57﹣2.43, =17.43﹣(6.57+2.43), =17.43﹣9, =8.43;

(181)20.47﹣(1.47+6.8), =20.47﹣1.47﹣6.8, =19﹣6.8, =12.2;

(182)13.26+4.71+3.47+5.29, =(13.26+3.47)+(4.71+5.29), =16.73+10, =26.73;

(183)22.74+8.68﹣13.74, =(22.74﹣13.74)+8.68, =9+8.68, =17.68

(184)10÷0.2÷2.5, =10÷(0.2×2.5), =10÷0.5, =20;

(185)64×4.5+3.6×45, =6.4×45+3.6×45, =(6.4+3.6)×45, =10×45, =450;

(186)1.25×3.2×0.8, =(1.25×0.8)×3.2,

小数混合运算---

=80

(190)0.125×9×8×0.3, =(0.125×8)×(9×8), =1×72, =72;

(191)4.62÷5÷0.66, =4.62÷(5×0.66), =4.62÷3.3, =1.4;

(192)5.78×2.3+5.78+5.78×6.7, =5.78×(2.3+1+6.7), =5.78×10, =57.8;

(193)7.75×[20÷(3.24﹣3.04)],=7.75×[20÷0.2], =7.75×100, =775

(194)1.25×0.5×8×0.2, =(1.25×8)×(0.5×0.2), =10×0.1, =1;

(195)0.97×9+0.97, =0.97×(9+1), =0.97×10, =9.7;

(196)5.4÷[3×﹙3.8﹣2.9﹚], =5.4÷[3×0.9], =5.4÷2.7, =2

(197)0.4×(3.2﹣0.8)÷0.15, =0.4×2.4÷0.15, =0.96÷0.15, =6.4;

(198)5.7+1.9×0.2÷7.6, =5.7+0.38÷7.6, =5.7+0.05, =5.75;

26

(199)32.4×6.3+32.4×3.7, =32.4×(6.3+3.7), =32.4×10, =324;

(200)18.2﹣10.6×(0.9﹣0.75), =20;

(211)3.08×3.5+6.2×3.08+3.08×0.3, =(3.5+6.2+0.3)×3.08, =10×3.08, =30.8

=18.2﹣10.6×0.15, =18.2﹣1.59, =16.61;

(201)0.25×3.85×40, =0.25×40×3.85, =10×3.85, =38.5;

(202)1.46×3.5+3.5×4.54, =3.5×(1.46+4.54), =3.5×6, =21

(203)7×12.5×0.8, =7×(12.5×0.8), =7×10, =70;

(204)4.7×3.6+4.7×6.4, =4.7×(3.6+6.4), =4.7×10, =47;

(205)1.45×[(2.8+4.4)÷2.4],=1.45×[7.2÷2.4], =1.45×3, =4.35

(206)4.2×(6.18﹣3.03)+6.3,=4.2×3.15+6.3, =13.23+6.3, =19.53;

(207)15.02﹣6.8﹣(1.02+1.2 ),=15.02﹣6.8﹣1.02﹣1.2, =(15.02﹣1.02)﹣(6.8+1.2), =14﹣8, =6;

(208)0.6×[(5﹣0.68)÷1.2],=0.6×[4.32÷1.2], =0.6×3.6, =2.16;

(209)2.7÷4+6.3×0.25, =2.7×0.25+6.3×0.25, =(2.7+6.3)×0.25, =9×0.25, =2.25; (210)(6.02+2.8 )÷0.4﹣2.05,=8.82÷0.4﹣2.05, =22.05﹣2.05,

小数混合运算---

(212)2.3+3.91÷(22﹣19.7), =2.3+3.91÷2.3, =2.3+1.7, =4;

(213)21.6÷[64.8﹣(48.6﹣2.7×2)], =21.6÷[64.8﹣(48.6﹣5.4)], =21.6÷[64.8﹣43.2], =21.6÷21.6, =1

(214)93.6×3.6+1.4×3.6, =(93.6+1.4)×3.6, =95×3.6,

=(100﹣5)×3.6, =100×3.6﹣5×3.6, =360﹣18, =342;

(215)0.25×0.8×0.125×0.4, =(0.25×0.4)×(0.8×0.125), =0.1×0.1, =0.01;

(216)2.7×1.5﹣2.7, =2.7×(1.5﹣1), =2.7×0.5, =1.35;

(217)9.08+5.45+11.92+4.55, =(9.08+11.92)+(5.45+4.55), =21+10, =31;

(218)1.25×30×1.2×0.8, =(1.25×0.8)×(30×1.2), =1×36, =36

(219)0.6+0.94﹣0.208, =1.54﹣0.208, =1.332;

(220)4.85×1.25×8, =4.85×(1.25×8), =4.85×10, =48.5; (221)(64﹣22.4÷1.4)×1.2, =(64﹣16)×1.2, =48×1.2, =57.6;

27

(222)18.3﹣6.25﹣3.75, =18.3﹣(6.25+3.75), =18.3﹣10, =8.3;

(223)2.8×3.6+1.4×2.8, =2.8×(3.6+1.4), =2.8×5, =14;

(224)6.6÷[14.5﹣(1.7+1.8)], =6.6÷[14.5﹣3.5], =6.6÷11, =0.6

(225)0.25×9.87×4, =0.25×4×9.87, =1×9.87, =9.87;

(226)7×2.1+10.8, =77.07+10.8, =87.87;

(227)8.45﹣0.45×0.1, =8.45﹣0.045, =8.405;

(228)0.73×102, =0.73×(100+2), =0.73×100+0.73×2, =73+1.46, =74.46;

(229)7.8×5.6+2.3×4.4, =43.68+10.12, =53.8;

(230)76.3×27﹣76.3×17 =76.3×(27﹣17), =76.3×10, =763.

(231)7.05×23.7+7.05×76.3 =(23.7+76.3)×7.05, =100×7.05, =705

(232)[(7.6﹣5.2)÷0.4+2.54]×32, =[2.4÷0.4+2.54]×32, =[6+2.54]×32, =8.54×32, =273.28

(233)17.68÷5.2+2.7×1.5, =3.4+4.05, =7.45;

(234)35.6﹣5×1.73, =35.6﹣8.65, =26.95;

小数混合运算---

(235)(1.1﹣0.78)×(2.7﹣1.95), =0.32×0.75, =0.24

(236)1.3×0.75×4, =1.3×3×0.25×4, =1.3×3×(0.25×4), =3.9×1, =3.9;

(237)1.08÷1.8×1.2, =0.6×1.2, =0.72;

(238)50.4×1.9﹣1.8, =95.76﹣1.8, =93.96;

(239)0.82×0.25+1.18×0.25, =(0.82+1.18)×0.25, =2×0.25, =0.5

(240)8.5×[(2.36+2.42)÷0.25], =8.5×[4.78÷0.25], =8.5×19.12, =162.52;

(241)3.9÷[(1.3+0.6)×6﹣3.6], =3.9÷[1.3×0.6+0.6×6﹣3.6], =3.9÷[0.78+3.6﹣3.6], =3.9÷0.78, =5;

(242)4.25×6.3+3.7×4.25, =4.25×(6.3+3.7), =4.25×10, =42.5;

(243)205×0.99, =205×(1﹣0.01), =205×1﹣205×0.01, =205﹣2.05, =202.95;

(244)25.6﹣7.49﹣2.51, =25.6﹣(7.49+2.51), =25.6﹣10, =15.6;

(245)[2.5﹣(6.8﹣4.9)]×0.8, =[2.5﹣1.9]×0.8, =0.6×0.8, =0.48

(246)102×4.5, =(100+2)×4.5, =100×4.5+2×4.5, =450+9,

28

=459;

(247)3.4÷[(1.2+0.5)×5], =3.4÷[1.7×5], =3.4÷8.5, =0.4;

(248)8×(20﹣1.25), =8×20﹣8×1.25, =160﹣10, =150;

(249)0.654+10.9×6.5, =0.654+70.85, =71.504;

(250)22.7×1.25×0.8, =22.7×(1.25×0.8), =22.7×1, =22.7;

(251)3.91×2.8+6.09×2.8, =(3.91+6.09)×2.8, =10×2.8, =28

(252)6.23+3.09=9.32, 6.23

(253)132.4﹣59.8=72.6; 132.4

(254)6.62×0.84=5.5608; 6.62

(255)2.07÷0.023=90;

(256)[20.026﹣(8.6+9.7)×0.92]÷30.19, =[20.026﹣18.3×0.92]÷30.19, =[20.026﹣16.836]÷30.19, =3.19÷30.19, =.

小数混合运算---

(257)0.125×32×2.5, =0.125×8×4×2.5,

=(0.125×8)×(4×2.5), =1×10, =10;

(258)0.8×6.3﹣0.8×3.8, =(6.3﹣3.8)×0.8, =2.5×0.8, =2;

(259)50.4÷3.2×2.08, =15.75×2.08, =32.76;

(260)204÷(3.4×0.5), =204÷1.7, =120; (261)(43.26+2.34)÷7.5, =45.6÷7.5, =6.08; (262)(20﹣0.8×9)×5.7, =(20﹣7.2)×5.7, =12.8×5.7, =72.96

(263)13.25﹣0.8+1.75﹣1.2, =(13.25+1.75)﹣(1.2+0.8), =15﹣2, =13;

(264)2.5×99+2.5, =2.5×(99+1), =2.5×100, =250;

(265)10.36+4.8﹣16.5÷5, =10.36+4.8﹣3.3, =15.16﹣3.3, =11.86;

(266)12.5×2.4, =12.5×(8×0.3), =(12.5×8)×0.3, =100×0.3, =30

(267)38.78﹣19.59+41.22﹣30.41,=38.78+41.22﹣19.59﹣30.41,

=(38.78+41.22)﹣(19.59+30.41),=80﹣50, =30;

(268)2.74×4.86+4.86×6.26+4.86,=(2.74+6.26+1)×4.86, =10×4.86, =48.6;

(269)0.08×(12.5+2.5)×0.1,

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=(0.08×12.5+0.08×2.5)×0.1, =(1+0.2)×0.1, =1.2×0.1, =0.12;

(270)25.92+(10.1﹣14.5×0.2), =25.92+(10.1﹣2.9), =25.92+7.2, =33.12;

(271)0.487×12.5÷48.7, =0.487÷48.7×12.5, =0.01×12.5, =0.125; (272)(8.16+2.09)÷[(10.3﹣9.3)÷0.4], =10.25÷[1÷0.4], =10.25÷2.5, =4.1

(273)1.56×1.7+0.44×1.7, =(1.56+0.44)×1.7, =2×1.7,

小数混合运算--- =3.4;

(274)12.5×(7.2﹣1.9)×0.8, =12.5×5.3×0.8, =12.5×0.8×5.3, =10×5.3, =53;

(275)0.25×2010+20.10×75, =0.25×2010+2010×0.75, =2010×(0.25+0.75), =2010×1, =2010;

(276)30.8÷[(6.34﹣4.59)×4], =30.8÷[1.75×4], =30.8÷7, =4.4.

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小数混合运算--- 31

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