六年级解方程专项练习题有答案

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六年级解方程专项练习200题(有答案)

(1)x ﹣=,

(2) x ××=,

(3)﹣4x=,

(4) 8×2.5﹣2x=13.6 (5) 0.78:x=3:5,

(6)1﹣20%x=0.4,

(8) 1÷(x ﹣)=6,(9)2x ﹣x=1.2,

(10)9×3﹣1.7x=13.4,(11)x﹣25%x=24,

(12)x ﹣+0.2=,

(13)0.6x+90%x=78,

(14)20%x﹣2.4×3=0.8,

(15)x ﹣x=42,

(16)0.6x+3×2.5=67.5,

(17)1÷(x﹣0.45)=5,(18)x﹣2.25=8.25,(19):x=3:12,

(20)x+0.8=5.6,

(21) 1.4:x=1:0.75,

(22) x×(2﹣)=24,

(23) 4x ﹣=3,

(24)12x+7×0.3=20.1,

(25)x+x=,

(26)x:42=,(27)×0.5+x=,(28)0.8:=0.48:x,(29)χ﹣χ=,(30)42:=χ:

(31)5x﹣0.4=75%,

( 32) 6x﹣0.9=4.5,

(33)2(x﹣3)=5.8,

(34) 1.6x=6.4,

(35) 4x﹣3×9=29,

(36)16+8x=40,

(37) x÷1.1=3,

(38)+2x=,

(39)×3﹣7x=1.04,(40)x﹣1﹣x=2,

(41)x ﹣x=14,

(42)3x ﹣x=,

(43)=,

(44)1.2:=,

(45)=:,(46):=x:0.8,(47)x =+1,

(48)1﹣25%X+25%x=+25%x,(49)

=,

(50)

×X=,

(51) 5:8=x:32,

(52)2x+3×0.9=24.9,(53)5.3x﹣2.9x=,

(54)×(7﹣2.8x)=1.5,(55)x:0.3=:,

(56)150%x+66=99

(57)x+6﹣0.8x=16

(58)

(59)

(60)3÷(X ﹣)=1.3

(61)(X+0.5):2=(X﹣4):,

(62) X÷0.05=3.528,

(63)2X﹣4×6=80,

(64)4×4.5﹣3X=6.38,

(65)4X﹣7.2=10,

(66)11.5X+X=20,

(67)3.8×12+15X=87.6,

(68)6X+5=17,

(69)0.6×(2.5+X)=4.2,

(70):=X :,

(71),

(72)

(73),

(74)4(+x)=,

(75)×0.25+x=,

(76)x ﹣,

(77)200:6=x :,

(78)4÷X=,

(79)8(x﹣2)=2(x+7),

(80):18%=,

(81)

﹣2x=,

(82)

x+x=46,

(83):x=:,

(84)=,

(85)5(3x﹣4)﹣2(x﹣1)=5(2x﹣1)(86)=,

(87)8(2X﹣7)=5(X+13),(88)3(x+4.5)=60,(89)1.6x+2.4=7.52,(90)3(x﹣0.8)=6.3,(91)28.4﹣5x=5.8,

(92)x :=

(93)+2x=,

(94)x=15%,

(95)x ﹣x=,

(96)x+50%x=6,

(97):x=0.3:12,(98)4x+2(8﹣x)=26,(99)x ﹣=0,

(100)+x=1,

(101)x ×(+)=,(102),(103),(104)x ﹣,(105)x ×,

(106)5x+35=650,

(107)720÷3x=80,(108)3.6x﹣0.9x=8.1,(109)4×4.5﹣3x=6,

(110)=,

(111)6×3﹣1.8X=7.2,

(112)÷x=,(113)x ÷=42,

(114)x+=,

(115)7x÷3=8.19,

(116)12:0.6=x :,

(117)3(x+2)=4(x+1),(118)3x﹣70%x=9.2,

(119) 6+x=240,

(120)22.5﹣0.4x=12.5,(121)x:3.5=4:2,(122)x﹣0.8x﹣6=16,(123):=x:8,(124),

(125)x:15=:,(126)x+x=,

(127)x×50%﹣x=5,(128)1﹣x=,

(129)2.5+1x=3,(130)3x﹣2=4,

(131)8.5﹣3x=2,(132)3÷x=4,

(133)x﹣5%=17.54,(134):=:(4﹣x),

(135) 6x+31=49,

(136) 7x÷3=8.19,

(137) 32.8﹣9x=17.5,(138) x﹣0.36x=16,(139) 6×7+3x=69,

(140) 6x+2x﹣56=0,(141) 3x﹣0.45×4=2.7,(142) 5.8x﹣4.6x=0.96,(143) 8.4÷(9﹣x)=3,(144) 3x÷1.2=8,

(145)5x+28=71,

(146)8.7﹣1.2x=3.9,(147)8x﹣2.6x=37.8,(148)0.75x﹣0.95×4=8.5,(149)54÷2+3x=72,(150)8x﹣2.6=37.8,

(151)x ÷=,

(152)x+30%x=26,(153) 7.8﹣3x=3.6,

(154) 6×3﹣1.8x=7.2,(155)10:x=4.5:0.8,

(156):=x :,

(157)X﹣7.65=4.64,

(158)28.25﹣X=8.25,

(159)X﹣(3.6+2.97)=12.42,

(160)÷x=,

(161)14.5=5.5,

(162)x﹣80%x=48,

(163)75%x﹣5×=6,

(164)x﹣6.8=15.4,

(165)1.9x=5.7,

(166)4.3y﹣y=4.6,

(167)5x+2.6=7.6,

(168) x﹣1.5=12.9,

(169) 9x+5x=8.4,

(170) 6.8+3.2x=14.8,

(171)5÷x=,

(172)﹣x=,

(173)4.5×﹣3x=1.5,

(174)(1+25%)x=0.5,

(175)x﹣40%x=9,

(176)x×20%=15.2,

(178)x ﹣x=,

(179)x÷75%=3,

(180)4x ﹣,(181):x=:4.5,

(182)(x﹣4.5)×6=12.5,(183)27﹣17x=13.4,

(184)9.6+3x=3.24×5,

(185)2x+5=5x﹣7,

(186) 3(x﹣2)=2﹣5(x﹣2),(187)4x﹣3(20﹣x)+4=0,

(188)﹣=1,

(189)4x﹣5×6=12,

(190)8x﹣3x=15.6,

(191)30×(x÷4)=60,

(192)7.2×0.5﹣3x=1.2,

(193)5x﹣2.4×5=8,

(194)+x=×2,

(195)5x+2.4×15=66,

(196)3.2x+2.8x-x=1,

(197)2.5×16-8x=12,

(198)9.6-3x=6.3,

(199)5(x+6)=75,

(200)x÷0.7+0.9×3=4,

解方程专项练习200题答案:(1)x ﹣=,

=,

x=;

(2) x ××=,

x=,

x×21=×21,

x=12;

(3)﹣4x=,

﹣4x+4x=+4x,

=+4x,

÷4=4x÷4,

x=.

(4) 8×2.5﹣2x=13.6

20﹣2x=13.6,

13.6+2X=20,

2X=6.4,

x=3.2;

(5) 0.78:x=3:5, 3x=0.78×5,

3x=3.9,

x=1.3

(6)1﹣20%x=0.4,

1﹣20%x+20%x=0.4+20%x,

0.4+20%x=1,

0.4+20%x﹣0.4=1﹣0.4,

20%x=0.6,

20%x ×=0.6×,

x=3;

(8) 1÷(x ﹣)=6,

1÷(x ﹣)×(x ﹣)=6×(x ﹣), 1=6×(x ﹣),

6x﹣6×=1,

6x﹣3=1,

6x=4,

6x÷6=4÷6,

x=

(9)2x ﹣x=1.2,

x(2﹣)=1.2,

x=1.2,

x ÷=1.2÷,

x=1;

(10)9×3﹣1.7x=13.4,

27﹣1.7x=13.4,

27﹣1.7x+1.7x=13.4+1.7x,

13.4+1.7x=27,

13.4+1.7x﹣13.4=27﹣13.4,

1.7x=13.6,

1.7x÷1.7=13.6÷1.7,

x=8

(11)x﹣25%x=24,

75%x=24,

75%x÷75%=24÷75%,

x=32;

(12)x ﹣+0.2=,

x﹣0.6=,

x﹣0.6+0.6=+0.6,

x=,

x ÷=÷,

x=1

(13)0.6x+90%x=78,

1.5x=78,

1.5x÷1.5=78÷1.5,

x=52;

(14)20%x﹣2.4×3=0.8,

20%x﹣7.2=0.8,

20%x﹣7.2+7.2=0.8+7.2,

20%x÷20%=8÷20%,

x=40;

(15)x ﹣x=42,

x=42,

x ÷=42÷,

x=252

(16)0.6x+3×2.5=67.5,

0.6x+7.5=67.5,

0.6x+7.5﹣7.5=67.5﹣7.5,

0.6x=60,

0.6x÷0.6=60÷0.6,

x=100;

(17)1÷(x﹣0.45)=5,

÷(x﹣0.45)×(x﹣0.45)=(x﹣0.45),x﹣2.4=1.6,

x﹣2.4+2.4=1.6+2.4,

x=4,

x ÷=4÷,

x=

(18)x﹣2.25=8.25,

x﹣2.25+2.25=8.25+2.25,

x=10.5;

(19):x=3:12, 3x=×12,

3x÷3=9÷3,

x=3

(20)x+0.8=5.6,

x+0.8﹣0.8=5.6﹣0.8,

x=4.8,

x ×=4.8×,

x=8.

(21) 1.4:x=1:0.75,

x=1.4×0.75,

x=1.05

(22) x×(2﹣)=24,

x ×=24,

x ×÷=24÷,

x=20;

(23) 4x ﹣=3,

4x ﹣+=3+,

4x=4,

4x÷4=4÷4,

x=1

(24)12x+7×0.3=20.1,

12x+2.1=20.1,

12x+2.1﹣2.1=20.1﹣2.1, 12x÷12=18÷12,

x=1.5;

(25)x+x=,

x=,

x ×,

x=;

(26)x:42=,

10x=42×,

10x÷10=30÷10,

x=3

(27)×0.5+x=,

0.75+x=3.75,

0.75+x﹣0.75=3.75﹣0.75,

x=3,

x ÷=3÷,

x=6;

(28)0.8:=0.48:x,

0.8x=×0.48,

0.8x=0.2,

0.8x÷0.8=0.2÷0.8,

x=

(29)χ﹣χ=,

x=,

x =,

x=3;

(30)42:=χ:

x=42×,

x =30,

x=50;

(31)5x﹣0.4=75%,

5x﹣0.4+0.4=75%+0.4,

5x÷5=1.15÷5,

x=0.23

( 32) 6x﹣0.9=4.5,

6x﹣0.9+0.9=4.5+0.9,

6x=5.4,

6x÷6=5.4÷6,

x=0.9;

(33)2(x﹣3)=5.8,

2(x﹣3)÷2=5.8÷2

x﹣3=2.9,

x﹣3+3=2.9+3,

x=5.9;

(34) 1.6x=6.4,

1.6x÷1.6=6.4÷1.6, x=4;

(35) 4x﹣3×9=29,

4x﹣27=29,

4x﹣27+27=29+27,

4x=56,

4x÷4=56÷4,

x=14;

(36)16+8x=40,

16+8x﹣16=40﹣16,

8x=24,

8x÷8=24÷8,

x=3;

(37) x÷1.1=3,

x÷1.1×1.1=3×1.1,

x=3.3

(38)+2x=,

+2x =,

2x=,

2x÷2=÷2,

x=;

(39)×3﹣7x=1.04,

2.16﹣7x=1.04,

2.16﹣7x﹣1.04=1.04﹣1.04, 1.12﹣7x=0,

7x÷7=1.12÷7,

x=0.16;

(40)x﹣1﹣x=2,

x﹣1=2,

x﹣1+1=2+1,

x=3,

x =3,

x=18;

(41)x ﹣x=14,

x=14,

x =14,

x=18;

(42)3x ﹣x=,

x=,

x =,

x=;

(43)=,

2.4x=72×0.26,

2.4x=18.72,

2.4x÷2.4=18.72÷2.4,

x=7.8;

(44)1.2:=,

x=1.2×5,

x=6,

x =6,

x=9;

(45)=:,

x=18×,

x=,

x =,

x=12;

(46):=x:0.8,

x=×0.8,

x =0.04,

x=0.2;

(47)x =+1,

x ×=×,

x=1

(48)1﹣25%X+25%x=+25%x,0.25x+0.25﹣0.25=1﹣0.25, 0.25x=0.75,

x=3;

(49)

=,

0.25x=1.25×1.6,

0.25x÷0.25=1.25×1.6÷0.25,

x=8;

(50)

×X=,

×X ÷=,

x=;

(51) 5:8=x:32,

8x=5×32,

8x÷8=5×32÷8,

x=20

(52)2x+3×0.9=24.9,

2x+2.7=24.9,

2x+2.7﹣2.7=24.9﹣2.7,

2x÷2=22.2÷2,

x=11.1;

(53)5.3x﹣2.9x=,

2.4x=,

2.4x÷2.4=÷2.4,

x=;

(54)×(7﹣2.8x)=1.5,

×(7﹣2.8x )=1.5,

7﹣2.8x=2.1,

7﹣2.8x+2.8x=2.1+2.8x,

7﹣2.1=2.1+2.8x﹣2.1, 4.9÷2.8=2.8x÷2.8,

x=1.75;

(55)x:0.3=:,

x=0.3×,

x =,

x=

(56)150%x+66=99

1.5x+66=99

1.5x=33

x=22

(57)x+6﹣0.8x=16

0.2x+6=16

0.2x=10

x=50

(58)

x=14.4

(59)

0.55x=5.5

x=10

(60)3÷(X ﹣)=1.3

3÷(X ﹣)×(x ﹣)=1.3×(x ﹣), 3=1.3x﹣0.78,

3+0.78=1.3x﹣0.78+0.78,

4.68=1.3x,

4.68÷1.3=1.3x÷1.3,

x=3.6;

(61)(X+0.5):2=(X﹣4):,

×(x﹣4)=(x+0.5)×,

x ﹣×4=x+×0.5,

x﹣10﹣x=x+x,

2.25x﹣10+10=0.125+10,

2.25x÷2.25=10.125÷2.25,

x=4.5

(62) X÷0.05=3.528,

X÷0.05×0.05=3.528×0.05,

X=0.1764;

(63)2X﹣4×6=80,

2X﹣24=80,

2X﹣24+24=80+24,

2X=104,

2X÷2=104÷2,

X=52;

(64)4×4.5﹣3X=6.38,

18﹣3X=6.38,

18﹣3X+3X=6.38+3X,

6.38+3X=18,

6.38+3X﹣6.38=18﹣6.38, 3X=11.62,

3X÷3=11.62÷3,

X=;

(65)4X﹣7.2=10,

4X﹣7.2+7.2=10+7.2,

4X=17.2,

4X÷4=17.2÷4,

X=4.3;

(66)11.5X+X=20,

12.5X=20,

12.5X÷12.5=20÷12.5,

X=1.6;

(67)3.8×12+15X=87.6,

45.6+15X=87.6,

45.6+15X﹣45.6=87.6﹣45.6,

15X=42,

15X÷15=42÷15,

X=2.8

(68)6X+5=17,

6x+5﹣5=17﹣5,

6x÷6=12÷6,

x=2;

(69)0.6×(2.5+X)=4.2,

0.6×(2.5+X)÷0.6=4.2÷0.6, 2.5+x=7,

2.5+x﹣2.5=7﹣2.5, x=4.5;

(70):=X :,

x=×,

x ÷=,

x=0.6

(71),

(72)

(73),

(74)4(+x)=,

+4x=,

+4x ﹣=﹣,

4x=4,

x=1;(75)×0.25+x=,

0.2+x=,

0.2+x﹣0.2=﹣0.2,

x=,

x=

(76)x ﹣,

x=;

(77)200:6=x :,

6x=200×,

6x÷6=480÷6,

x=80

(78)4÷X=,

4÷X×X=X,

X=4,

X ÷=4÷,

X=10;

(79)8(x﹣2)=2(x+7), 8X﹣16=2X+14,

6X﹣16=14,

6X=30,

X=5;

(80):18%=,

X=0.18×6.5,

X=1.17,

X=7.8

(81)

﹣2x=,

﹣2x+2x=+2x,

+2x=,

+2x ﹣=﹣,

2x=,

2x÷2=÷2,

x=;

(82)

x+x=46,

x (+)=46,

x=46,

x ÷=46÷,

x=40;

(83):x=:,

x=×,

x=,

x ÷=÷,

x=;

(84)=,

1.6x=6.4×2,

1.6x=1

2.8,

1.6x÷1.6=1

2.8÷1.6,

x=8

(85)5(3x﹣4)﹣2(x﹣1)=5(2x﹣1)

15x﹣20﹣2x+2=10x﹣5,

13x﹣18=10x﹣5,

13x﹣18﹣10x=10x﹣5﹣10x, 3x﹣18=﹣5,

3x﹣18+18=﹣5+18,

3x=13,

3x÷3=13÷3,

x=;

(86)=,

3(6x﹣1)=64,

18x﹣3=64,

18x﹣3+3=64+3,

18x=67,

18x÷18=67÷18,

x=

(87)8(2X﹣7)=5(X+13),

16x﹣56=5x+65,

16x﹣56﹣5x=5x+65﹣5x,

11x﹣56=65,

11x﹣56+56=65+56,

11x=121,

11x÷11=121÷11,

x=11,

(88)3(x+4.5)=60,

3(x+4.5)÷3=60÷3,

x+4.5=20,

x+4.5﹣4.5=20﹣4.5,

x=15.5

(89)1.6x+2.4=7.52,

1.6x+

2.4﹣2.4=7.52﹣2.4,

1.6x=5.12,

1.6x÷1.6=5.12÷1.6,

x=3.2;

(90)3(x﹣0.8)=6.3,

3x﹣2.4=6.3,

3x﹣2.4+2.4=6.3+2.4,

3x=8.7, 3x÷3=8.7÷3, x=2.9;(91)28.4﹣5x=5.8,

28.4﹣5x+5x=5.8+5x,

5.8+5x=28.4,

5.8+5x﹣5.8=28.4﹣5.8, 5x=22.6,

5x÷5=22.6÷5,

x=4.52

(92)x :=

25x=×3,

25x=,

25x÷25=,

x=;

(93)+2x=,

+2x =,

2x=0,

x=0;

(94)x=15%,

x×x=15%x,

0.15x=0.15,

0.15x÷0.15=0.15÷0.15, x=1;

(95)x ﹣x=,

x=,

x =,

x=.

(96)x+50%x=6,

1.5x=6,

1.5x÷1.5=6÷1.5, x=4;

(97):x=0.3:12,

0.3x=,

0.3x÷0.3=9÷0.3,

x=30;

(98)4x+2(8﹣x)=26,

4x+16﹣2x=26,

2x+16=26,

2x+16﹣16=26﹣16, 2x÷2=10÷2, x=5

(99)x ﹣=0,

x ﹣+=0+,

x=,

x×3=×3,

x=;

(100)+x=1,

+x ﹣=1﹣,

x=,

x ×=×,

x=1;

(101)x ×(+)=,x=,

x ×=×,

x=.(102),

3x÷3=, x=;(103),

x=20;(104)x ﹣,

x=;

(105)x ×,

x ×, x=

(106)5x+35=650,

5x+35﹣35=650﹣35, 5x=615,

5x÷5=615÷5,

x=123;(107)720÷3x=80,

720÷3x×3x=80×3x,

240x=720,

240x÷240=720÷240,

x=3;

(108)3.6x﹣0.9x=8.1,(3.6﹣0.9)x=8.1,

2.7x=8.1,

2.7x÷2.7=8.1÷2.7, x=3;

(109)4×4.5﹣3x=6,

18﹣3x=6,

18﹣3x+3x=6+3x,

6+3x=18,

6+3x﹣6=18﹣6,

3x=12,

3x÷3=12÷3,

x=4

(110)=,

2.5x=10×0.8,

2.5x÷2.5=8÷2.5,

x=3.2;

(111)6×3﹣1.8X=7.2,

18﹣1.8X=7.2,

18﹣1.8X+1.8X=7.2+1.8X, 7.2+1.8X=18,

7.2+1.8X﹣7.2=18﹣7.2, 1.8X=10.8,

1.8X÷1.8=10.8÷1.8, X=6

(112)÷x=,

x=÷,

x=;(113)x ÷=42,

x=42×,

x=9;

(114)x+=,

x+﹣=﹣,

x=,

x ÷=÷,

x=

(115)7x÷3=8.19,

7x÷3×3=8.19×3,

7x=24.57,

7x÷7=24.57÷7,

x=3.51;

(116)12:0.6=x :,

0.6x=12×,

0.6x=6,

0.6x÷0.6=6÷0.6,

x=10;

(117)3(x+2)=4(x+1), 3x+6=4x+4,

3x+6﹣3x=4x+4﹣3x,

x+4=6,

x+4﹣4=6﹣4,

x=2

(118)3x﹣70%x=9.2,

3x﹣0.7x=9.2,

2.3x=9.2,

2.3x÷2.3=9.2÷2.3,

x=4;(119) 6+x=240,

6+x﹣6=240﹣6,

x=234,

x ÷=234÷,

x=390

(120)22.5﹣0.4x=12.5,

22.5﹣0.4x+0.4x=12.5+0.4x, 12.5+0.4x=22.5,

12.5+0.4x﹣12.5=22.5﹣12.5, 0.4x÷0.4=10÷0.4,

x=25;

(121)x:3.5=4:2,

2x=3.5×4,

2x÷2=14÷2,

x=6

(122)x﹣0.8x﹣6=16,

0.2x﹣6=16,

0.2x﹣6+6=16+6,

0.2x÷0.2=22÷0.2,

x=110;(123):=x:8,

x=8×,

x ×=8××,

x=4;

(124),

0.06x=2×0.015,

0.06x÷0.06=0.03÷0.06,

x=0.5;

(125)x:15=:,

x=15×,

x×6=15××6,

x=40;

(126)x+x=,

x=,

x ×=×,

x=;(127)x×50%﹣x=5,

x=5,

x×6=5×6,

x=30;(128)1﹣x=,

1﹣x+x=+x,

+x=1,

+x ﹣=1﹣,

x ×=×,

x=;

(129)2.5+1x=3,

2.5+1x﹣2.5=3﹣2.5,

x=,

x ×=×,

x=

(130)3x﹣2=4,

3x﹣2+2=4+2,

3x=6,

3x÷3=6÷3, x=;(131)8.5﹣3x=2,

8.5﹣3x+3x=2+3x, 3x+2=8.5,

3x+2﹣2=8.5﹣2,

3x=6,

3x÷3=6÷3,

x=2;

(132)3÷x=4,

3÷x×x=4×x,

4x=3,

4x÷4=3÷4,

x=

(133)x﹣5%=17.54,

解:x﹣5%+5%=17.54+5%,

x =17.59,

x=23;(134):=:(4﹣x),解:4x=,

2﹣x+x=x,

2﹣+x,

=x,

x=3

(135) 6x+31=49,

6x+31﹣31=49﹣31,

6x=18,

6x÷6=18÷6,

x=3;

(136) 7x÷3=8.19,

7x÷3×3=8.19×3,

7x=24.57,

7x÷7=24.57÷7,

x=3.51;

(137) 32.8﹣9x=17.5,

32.8﹣9x+9x=17.5+9x,

17.5+9x=32.8,

17.5+9x﹣17.5=32.8﹣17.5,

9x=15.3,

9x÷9=15.3÷9,

x=1.7;

(138) x﹣0.36x=16,

(1﹣0.36)x=16,

0.64x=16,

0.64x÷0.64=16÷0.64,

x=25;

(139) 6×7+3x=69,

42+3x=69,

42+3x﹣42=69﹣42,

3x=27,

3x÷3=27÷3,

x=9;

(140) 6x+2x﹣56=0,

(6+2)x﹣56+56=0+56,

8x=56,

8x÷8=56÷8,

x=7

(141) 3x﹣0.45×4=2.7,

3x﹣1.8=2.7,

3x﹣1.8+1.8=2.7+1.8,

3x=4.5,

3x÷3=4.5÷3,

x=1.5;

(142) 5.8x﹣4.6x=0.96,

1.2x=0.96,

1.2x÷1.2=0.96÷1.2,

x=0.8;

(143) 8.4÷(9﹣x)=3,

9﹣x=8.4÷3,

9﹣x=2.8,

x=9﹣2.8,

x=6.2;

(144) 3x÷1.2=8,

3x÷1.2×1.2=8×1.2,

3x=9.6,

3x÷3=9.6÷3,

x=3.2

(145)5x+28=71,

5x+28﹣28=71﹣28,

5x=43,

5x÷5=43÷5,

x=8.6;

(146)8.7﹣1.2x=3.9,

8.7﹣1.2x+1.2x﹣3.9=3.9+1.2x﹣3.9, 4.8=1.2x, 1.2x=4.8,

1.2x÷1.2=4.8÷1.2,

x=4;

(147)8x﹣2.6x=37.8,

5.4x=37.8,

5.4x÷5.4=37.8÷5.4,

x=7;

(148)0.75x﹣0.95×4=8.5,

0.75x﹣3.8=8.5,

0.75x﹣3.8+3.8=8.5+3.8, 0.75x=12.3,

0.75x÷0.75=12.3÷0.75, x=16.4,;(149)54÷2+3x=72,

27+3x=72,

27+3x﹣27=72﹣27,

3x=45,

3x÷3=45÷3,

x=15;

(150)8x﹣2.6=37.8,

8x﹣2.6+2.6=37.8+2.6,

8x=40.4,

8x÷8=40.4÷8,

x=5.05

(151)x ÷=,

x ÷×=×,

x=,

x×4=×4,

x=;

(152)x+30%x=26,

(1+30%)x=26,

1.3x=26,

1.3x÷1.3=26÷1.3,

x=20;

(153) 7.8﹣3x=3.6,

7.8﹣3x+3x=3.6+3x,

3.6+3x=7.8,

3.6+3x﹣3.6=7.8﹣3.6,

3x=4.2,

3x÷3=4.2÷3,

x=1.4

(154) 6×3﹣1.8x=7.2,

18﹣1.8x=7.2,

18﹣1.8x+1.8x=7.2+1.8x,

18=7.2+1.8x,

18﹣7.2=7.2+1.8x﹣7.2, 10.8=1.8x,

10.8÷1.8=1.8x÷1.8,

x=6;

(155)10:x=4.5:0.8,

4.5x=10×0.8,

4.5x=8,

4.5x÷4.5=8÷4.5,

x=;

(156):=x :,

x=×,

x=,

x ÷=÷,

x=

(157)X﹣7.65=4.64,

X﹣7.65+8.67=4.64+7.65,

X=12.29;

(158)28.25﹣X=8.25,

28.25﹣X+X=8.25+X,

X+8.25=28.25,

X+8.25﹣8.25=28.25﹣8.25,

X=20;

(159)X﹣(3.6+2.97)=12.42,

X﹣6.57=12.42,

X﹣6.57+6.57=12.42+6.57, X=18.99

(160)÷x=,

÷x×x=×x,

x=,

x ÷=÷,

x=×,

x=;

(161)14.5=5.5,

14.5+14.5=5.5+14.5,

=20,

×8=20×8,

x=160

(162)x﹣80%x=48,

(1﹣0.8)x=48,

0.2x=48,

0.2x÷0.2=48÷0.2, x=240;

(163)75%x﹣5×=6,

0.75x﹣3=6,

0.75x﹣3+3=6+3,

0.75x=9,

0.75x÷0.75=9÷0.75, x=12

(164)x﹣6.8=15.4,

x﹣6.8+6.8=15.4+6.8, x=22.2;(165)1.9x=5.7,

1.9x÷1.9=5.7÷1.9,

x=3;

(166)4.3y﹣y=4.6,

3.3y=

4.6,

3.3y÷3.3=

4.6÷3.3,

y=;

(167)5x+2.6=7.6,

5x+2.6﹣2.6=7.6﹣2.6,

5x=5,

5x÷5=5÷5,

x=1

(168) x﹣1.5=12.9,

x﹣1.5+1.5=12.9﹣1.5, x=11.4;

(169) 9x+5x=8.4,

14x=8.4,

14x÷14=8.4÷14,

x=0.6;

(170) 6.8+3.2x=14.8,

6.8﹣6.8+3.2x=14.8﹣6.8, 3.2x=8,

3.2x÷3.2=8÷3.2,

x=2.5

(171)5÷x=,

5÷x×x=x,

5=x,

5÷=x ÷,

x=;

(172)﹣x=,

﹣x+x=+x,

=+x,

﹣=+x ﹣,

=x,

÷==x ÷,

x=1;

(173)4.5×﹣3x=1.5,

1.5﹣3.5x=1.5,

1.5﹣3.5x+3.5x=1.5+3.5x,

1.5=1.5+3.5x,

1.5﹣1.5=1.5+3.5x﹣1.5, 0=3.5x,

0÷3.5=3.5x÷3.5,

x=0

(174)(1+25%)x=0.5,

1.25x=0.5,

1.25x÷1.25=0.5÷1.25,

x=0.4;

(175)x﹣40%x=9,

0.6x=9,

0.6x÷0.6=9÷0.6,

x=15;

(176)x×20%=15.2,

x×20%÷20%=15.2÷20%,

x=76

(177)30x﹣30=180,

30x﹣30+30=180+30,

30x=210,

30x÷30=210÷30,

x=7;

(178)x ﹣x=,

x=,

x ÷=÷,

x=;

(179)x÷75%=3,

x÷75%×75%=3×75%,

x=,

x ÷=÷,

x=

(180)4x ﹣,

4x﹣6=2.4,

4x=2.4+6,

x=8.4÷4,

x=2.1.(181):x=:4.5,

x=4.5×,

x=2,

x=2×,

x=5

(182)(x﹣4.5)×6=12.5,

6x﹣4.5×6=12.5,

6x﹣27=12.5,

6x﹣27+27=12.5+27, 6x=39.5,

6x÷6=39.5÷6, x=6;

(183)27﹣17x=13.4,

27﹣17x+17x=13.4+17x,

13.4+17x=27,

13.4+17x﹣13.4=27﹣13.4,

17x=13.6,

17x÷17=13.6÷17,

x=0.8;

(184)9.6+3x=3.24×5,

9.6+3x﹣9.6=16.2﹣9.6,

3x=6.6,

3x÷3=6.6÷3,

x=2.2

(185)2x+5=5x﹣7,

2x+5﹣2x=5x﹣7﹣2x,

3x﹣7=5,

3x﹣7+7=5+7,

3x=12,

3x÷3=12÷3,

x=4;

(186) 3(x﹣2)=2﹣5(x﹣2), 3x﹣6=12﹣5x,

3x﹣6+5x=12﹣5x+5x,

8x﹣6=12,

8x﹣6+6=12+6,

8x=18,

8x÷8=18÷8,

x=2.25;

(187)4x﹣3(20﹣x)+4=0,

7x﹣56=0,

7x﹣56+56=0+56,

7x=56,

7x÷7=56÷7,

x=8;

(188)﹣=1,

(﹣)×24=1×24,

6(y+2)﹣4(2y﹣3)=24,

30﹣2y=24,

30﹣2y+2y=24+2y, 2y+24=30,

2y+24﹣24=30﹣24, 2y=6,

2y÷2=6÷2,

y=3 (189)4x﹣5×6=12,

4x﹣30=12,

4x﹣30+30=12+30,

4x=42,

4x÷4=42÷4,

x=10.5;

(190)8x﹣3x=15.6,

5x=15.6,

5x÷5=15.6÷5,

x=3.12;

(191)30×(x÷4)=60,

30×(x÷4)÷30=60÷30,

x÷4=2,

x÷4×4=2×4,

x=8;

(192)7.2×0.5﹣3x=1.2, 3.6﹣3x=1.2,

3.6﹣3x+3x=1.2+3x, 3x+1.2=3.6,

3x+1.2﹣1.2=3.6﹣1.2, 3x=2.4,

3x÷3=2.4÷3,

x=0.8 (193)5x﹣2.4×5=8,

5x﹣12+12=8+12, 5x=20,

5x÷5=20÷5, x=4,

(194)+x=×2,

x=,

x ×=×,

x=.

(195)5x+2.4×15=66,

5x+36=66,

5x+36-36=66-36,

5x=30,

5x÷5=30÷5,

x=6;

(196)3.2x+2.8x-x=1,

5x=1,

5x÷5=1÷5,

x=0.2;

(197)2.5×16-8x=12,

40-8x=12,

40-8x+8x=12+8x,

8x+12=40,

8x+12-12=40-12,

8x=28,

8x÷8=28÷8,

x=3.5.

(198)9.6-3x=6.3,

9.6-3x+3x=6.3+3x,

6.3+3x=9.6,

6.3+3x-6.3=9.6-6.3,

3x=3.3,

3x÷3=3.3÷3,

x=1.1;

(199)5(x+6)=75,

5x+30=75,

5x+30-30=75-30,

5x=45,

5x÷5=45÷5,

x=9;

(200)x÷0.7+0.9×3=4,x÷0.7+2.7=4,

x÷0.7+2.7-2.7=4-2.7,x÷0.7=1.3,

x÷0.7×0.7=1.3×0.7,x=0.91.

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