小数方程计算专项练习进步题.docx

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小数方程计算专项练习进步题.docx

小数方程计算专项练习进步题

小数方程专项练习(有答案)

(1)(x+0.55)×4=3.6

(2)2x÷8=0.8

(3)1.5×2+2x=5

(4)4.7x=1.9x+7

(5)12.6(x+4.8)÷2=63

(6)12.5+4x=21.7

(7)13.5x﹣8.5x=20

 

(8)6x﹣8.5×4=20

(9)36÷x=0.4

(10)9.6x﹣x=43

(11)3x﹣4×0.9=46.2

(12)3.5x﹣4×7=42

(13)x﹣0.9x=81.9

(14)3.8+5x=12.3

(15)4(0.3+x)=6.8

(16)8x﹣1.6x=19.2

(17)x÷1.8=1.62

(18)22.5×2+5x=135,

(19)1.4x+9.8=22.4,

(20)2(x﹣3)=11.6,

(21)68﹣4.4x=24,

(22)1.6×8﹣5x=2.3

(23)2.5x÷20=16

(24)6.2x﹣x=41.6

(25)x÷0.5=48.6×2

(26)5X﹣7.8=20.2,

(27)2.5X﹣X=1.8,

(28)(4.5+X)×2=13,

 

(29)7x﹣2×9=80,

(30)13x﹣7.5x=18.7,

(31)(x+12)×6=108,

 

(32)4x+3×0.7=6.5

(33)2×(x﹣0.5)=1.6

(34)3x×2.34=4.914

(35)1.44÷x=0.4

(36)2x+6=12.5

(37)2.5x﹣x=1.2

(38)(4.5+x)×2=63

(39)2x﹣2.5×10=15

(40)3.85+1.5x=6.1

(41)13(x+2.5)=169

(42)2x﹣2+1.8=3.6

(43)7(x﹣1.2)=3.57

(44)2+1.8﹣2x=3.6

(45)7x÷0.3=4.2

(46)6x+4x﹣11=32.9

(47)7(x﹣1.2)=2.87

(48)2.4+3.4x=5.8

(49)5(x﹣1.2)=35

(50)2.5x+51=17×8

(51)2.4x+1.6x=2.2

(52)8(x﹣6.2)=41.6

(53)0.5(x﹣0.5)=7.5

(54)(9x+1.5+7x)÷5=5.1

(55)3x+7=29.5

(56)5x﹣2.8×1.2=1.04

(57)4x+6x=28.5

(58)2.38x+9.8=33.6

(59)2(x﹣3)=10.6

(60)13x﹣x=14.4

(61)68﹣1.1x=24

 

(62)3(x+3.5)=21.6

(63)3x﹣54=136.5

(64)x﹣0.36x=3.2

(65)4x+2.8×4=19.32

 

(66)4x﹣5.2=5.2

(67)4.8x+2.6x=3.7

(68)3x+6.4×2=50.3

 

(69)2.7x﹣1.8=1.2x+2.7,

(70)8﹣5(6x+0.7)=10x+0.5,

(71)7÷x﹣0.7=1.3,

(72)(5.9+x)÷3+16=30,

 

(73)0.56×5﹣4x=0.4,

(74)4(x﹣0.5)=9.6,

 

(75)2×(x+1.7)=9.2

(76)8x﹣4x=0.64

(77)2x﹣0.24=0.12

(78)(3.8﹣2)x=14.4

(79)64﹣16X=56.8

(80)8.6X﹣2.6X=36.6

(82)6×4﹣0.6X=6.36

(83)0.03×150﹣5x=3.2

(84)45.3﹣4X=35.7,

(85)3(5.4+X)÷6=7.2,

(86)5.9X+7=8.7X,

(87)3+0.6x=4.32

(88)0.6(y﹣0.4)=6,

 

小数方程88题参考答案:

 

 

(1)(x+0.55)×4=3.6

(x+0.5)×4÷4=3.6÷4

x+0.5=0.9

x+0.5﹣0.5=0.9﹣0.5

x=0.4

(2)2x÷8=0.8

2x÷8×4=0.8×4

x=3.2

(3)1.5×2+2x=5

3+2x=5

3+2x﹣3=5﹣3

2x÷2=2÷2

x=1 

(4)4.7x=1.9x+7

4.7x﹣1.9x=1.9x﹣1.9x+7

2.8x=7

2.8x÷2.8=7÷2.8

x=2.5

(5)12.6(x+4.8)÷2=63

6.3×(x+4.8)=63

6.3×(x+4.8)÷6.3=63÷6.3

x+4.8=10

x+4.8﹣4.8=10﹣4.8

x=5.2;

(6)12.5+4x=21.7

12.5+4x﹣12.5=21.7﹣12.5

4x÷4=9.2÷4

x=2.3

(7)13.5x﹣8.5x=20

5x÷5=20÷5

x=4

(8)6x﹣8.5×4=20

6x﹣34=20

6x﹣34+34=20+34

6x÷6=54÷6

x=9 

(9)36÷x=0.4

36÷x×x=0.4×x

36=0.4×x

36÷0.4=0.4×x÷0.4

x=90;

(10)9.6x﹣x=43

(9.6﹣1)x=43

8.6x÷8.6=43÷8.5

x=5;

(11)3x﹣4×0.9=46.2

3x﹣3.6=46.2

3x﹣3.6+3.6=46.2+3.6

3x÷3=49.8÷3

x=16.6 

(12)3.5x﹣4×7=42

3.5x﹣28=42

3.5x﹣28+28=42+28

3.5x=70

3.5x÷3.5=70÷3.5

x=20;

(13)x﹣0.9x=81.9

0.1x=81.9

0.1x÷0.1=81.9÷0.1

x=819;

(14)3.8+5x=12.3

3.8+5x﹣3.8=12.3﹣3.8

5x=8.5

5x÷5=8.5÷5

x=1.7;

(15)4(0.3+x)=6.8

4(0.3+x)÷4=6.8÷4

0.3+x=1.7

0.3+x﹣0.3=1.7﹣0.3

x=1.4

(16)8x﹣1.6x=19.2

6.4x=19.2,

6.4x÷6.4=19.2÷6.4,

x=3;

(17)x÷1.8=1.62

x÷1.8×1.8=1.62×1.8,

x=2.916;

(18)22.5×2+5x=135,

45+5x﹣45=135﹣45,

5x÷5=90÷5,

x=18.

(19)1.4x+9.8=22.4,

1.4x+9.8﹣9.8=22.4﹣9.8,

1.4x=12.6,

1.4x÷1.4=12.6÷1.4,

x=9;

(20)2(x﹣3)=11.6,

2x﹣6=11.6,

2x﹣6+6=11.6+6,

2x=17.6,

2x÷2=17.6÷2,

x=8.8;

(21)68﹣4.4x=24,

68﹣4.4x+4.4x=24+4.4x,

24+4.4x=68,

24+4.4x﹣24=68﹣24,

4.4x=44,

4.4x÷4.4=44÷4.4,

x=10 

(22)1.6×8﹣5x=2.3

12.8﹣5x+5x=2.3+5x

2.3+5x﹣2.3=12.8﹣2.3

5x÷5=10.5÷5

x=2.1;

(23)2.5x÷20=16

2.5x÷20×20=16×20

2.5x÷2.5=320÷2.5

x=128;

(24)6.2x﹣x=41.6

5.2x=41.6

5.2x÷5.2=41.6÷5.2

x=8;

(25)x÷0.5=48.6×2

x÷0.5=97.2

x÷0.5×0.5=97.2×0.5

 x=48.6

(26)5X﹣7.8=20.2,

5x﹣7.8+7.8=20.2+7.8,

5x÷5=28÷5,

x=5.6;

(27)2.5X﹣X=1.8,

1.5x÷1.5=1.8÷1.5,

x=1.2;

(28)(4.5+X)×2=13,

(4.5+x)×2÷2=13÷2,

4.5+x﹣4.5=6.5﹣4.5,

x=2. 

(29)7x﹣2×9=80,

7x﹣18=80,

7x﹣18+18=80+18,

7x=98,

7x÷7=98÷7,

x=14;

(30)13x﹣7.5x=18.7,

(13﹣7.5)x=18.7,

5.5x=18.7,

5.5x÷5.5=18.7÷5.5,

x=3.4;

(31)(x+12)×6=108,

(x+12)×6÷6=108÷6,

x+12=18,

x+12﹣12=18﹣12,

x=6. 

(32)4x+3×0.7=6.5

4x+2.1=6.5

4x+2.1﹣2.1=6.5﹣2.1

4x=4.4

4x÷4=4.4÷4

x=1.1

(33)2×(x﹣0.5)=1.6

2x﹣1=1.6

2x﹣1+1=1.6+1

2x=2.6

2x÷2=2.6÷2

x=1.3

(34)3x×2.34=4.914

7.02x=4.914

7.02x÷7.02=4.914÷7.02

x=0.7

(35)1.44÷x=0.4

1.44÷x×x=0.4×x

0.4x=1.44

0.4x÷0.4=1.44÷0.4

x=3.6 

(36)2x+6=12.5

2x+6﹣6=12.5﹣6

2x÷2=6.5÷2

x=3.25;

(37)2.5x﹣x=1.2

1.5x=1.2

1.5x÷1.5=1.2÷1.5

x=0.8;

(38)(4.5+x)×2=63

(4.5+x)×2÷2=63÷2

4.5+x﹣4.5=31.5﹣4.5

x=27;

(39)2x﹣2.5×10=15

2x﹣25+25=15+25

2x÷2=40÷2

x=20. 

(40)3.85+1.5x=6.1

3.85+1.5x=6.1

3.85﹣3.85+1.5x=6.1﹣3.85

1.5x=2.25

1.5x÷1.5=2.25÷1.5

x=1.5

(41)13(x+2.5)=169

13(x+2.5)÷13=169÷13

x+2.5=13

x+2.5﹣2.5=13﹣2.5

x=11.5 

(42)2x﹣2+1.8=3.6

2x﹣0.2=3.6

2x+0.2﹣0.2=3.6+0.2

2x=3.8

2x÷2=3.8÷2

x=1.9

(43)7(x﹣1.2)=3.57

7(x﹣1.2)÷7=3.57÷7

x﹣1.2=0.51

x+1.2﹣1.2=1.2+0.51

x=1.71 

(44)2+1.8﹣2x=3.6

3.8﹣2x+2x=3.6+2x

3.8﹣3.6=3.6+2x﹣3.6

0.2÷2=2x÷2

x=0.1;

(45)7x÷0.3=4.2

7x÷0.3×0.3=4.2×0.3

7x÷7=1.26÷7

x=0.18;

(46)6x+4x﹣11=32.9

10x﹣11+11=32.9+11

10x÷10=43.9÷10

x=4.39;

(47)7(x﹣1.2)=2.87

7(x﹣1.2)÷7=2.87÷7

x﹣1.2+1.2=0.41+1.2

x=1.61 

(48)2.4+3.4x=5.8

2.4+3.4x﹣2.4=5.8﹣2.4

3.4x=3.4

3.4x÷3.4=3.4÷3.4

x=1;

(49)5(x﹣1.2)=35

5(x﹣1.2)÷5=35÷5

x﹣1.2=7

x﹣1.2+1.2=7+1.2

x=8.2;

(50)2.5x+51=17×8

2.5x+51=136

2.5x+51﹣51=136﹣51

2.5x=85

2.5x÷2.5=85÷2.5

x=34. 

(51)2.4x+1.6x=2.2

4x=2.2

4x÷4=2.2÷4

x=0.55;

(52)8(x﹣6.2)=41.6

8(x﹣6.2)÷8=41.6÷8

x﹣6.2+6.2=5.2+6.2

x=11.4.

(53)0.5(x﹣0.5)=7.5

0.5(x﹣0.5)÷0.5=7.5÷0.5

x﹣0.5=15

x﹣0.5+0.5=15+0.5

x=15.5;

(54)(9x+1.5+7x)÷5=5.1

(16x+1.5)÷5=5.1

(16x+1.5)÷5×5=5.1×5

16x+1.5=25.5

16x+1.5﹣1.5=25.5﹣1.5

16x=24

16x÷16=24÷16

x=1.5;

(55)3x+7=29.5

3x+7﹣7=29.5﹣7

3x=22.5

3x÷3=22.5÷3

x=7.5

(56)5x﹣2.8×1.2=1.04

5x﹣3.36=1.04

5x﹣3.36+3.36=1.04+3.36

5x=4.4

5x÷5=4.4÷5

x=0.88

(57)4x+6x=28.5

10x=28.8

10x÷10=28.5÷10

x=2.85 

(58)2.38x+9.8=33.6

2.38x+9.8﹣9.8=33.6﹣9.8

2.38x÷2.38=23.8÷2.38

x=10

(59)2(x﹣3)=10.6

2(x﹣3)÷2=10.6÷2

x﹣3+3=5.3+3

x=8.3;

(60)13x﹣x=14.4

12x=14.4

12x÷12=14.4÷12

x=1.2;

(61)68﹣1.1x=24

68﹣1.1x+1.1x=24+1.1x

68﹣24=24+1.1x﹣24

44÷1.1=1.1x÷1.1

x=40.

 

(62)3(x+3.5)=21.6

3(x+3.5)÷3=21.6÷3

x+3.5﹣3.5=7.2﹣3.5

x=3.7;

(63)3x﹣54=136.5

3x﹣54+54=136.5+54

3x÷3=190.5÷3

x=63.5;

(64)x﹣0.36x=3.2

0.64x=3.2

0.64x÷0.64=3.2÷0.64

x=5;

(65)4x+2.8×4=19.32

4x+11.2﹣11.2=19.32﹣11.2

4x÷4=8.12÷4

x=2.03. 

(66)4x﹣5.2=5.2

4x﹣5.2+5.2=5.2+5.2

4x=10.4

4x÷4=10.4÷4

x=2.6;

(67)4.8x+2.6x=3.7

7.4x=3.7

7.4x÷7.4=3.7÷7.4

x=0.5;

(68)3x+6.4×2=50.3

3x+12.8=50.3

3x+12.8﹣12.8=50.3﹣12.8

3x=37.5

3x÷3=37.5÷3

x=12.5. 

(69)2.7x﹣1.8=1.2x+2.7,

2.7x﹣1.8+1.8=1.2x+2.7+1.8,

2.7x﹣1.2x=1.2x+4.5﹣1.2x,

1.5x÷1.5=4.5÷1.5,

x=3;

(70)8﹣5(6x+0.7)=10x+0.5,

8﹣30x﹣3.5=10x+0.5,

4.5﹣30x+30x=10x+0.5+30x,

4.5﹣0.5=40x﹣0.5,

4÷40=40x÷40,

x=0.1;

(71)7÷x﹣0.7=1.3,

7÷x﹣0.7+0.7=1.3+0.7,

7÷x×x=2×x,

7÷2=2x÷2,

x=3.5;

(72)(5.9+x)÷3+16=30,

(5.9+x)÷3+16﹣16=30﹣16,

(5.9+x)÷3×3=14×3,

5.9+x﹣5.9=42﹣5.9,

x=36.1. 

(73)0.56×5﹣4x=0.4,

2.8﹣4x=0.4,

2.8﹣4x+4x=0.4+4x,

0.4+4x=2.8,

0.4+4x﹣0.4=2.8﹣0.4,

4x=2.4,

4x÷4=2.4÷4,

x=0.6;

(74)4(x﹣0.5)=9.6,

4x﹣2=9.6,

4x﹣2+2=9.6+2,

4x=11.6,

4x÷4=11.6÷4,

x=2.9. 

(75)2×(x+1.7)=9.2

2×(x+1.7)÷2=9.2÷2

x+1.7=4.6

x+1.7﹣1.7=4.6﹣1.7

x=2.9.

(76)8x﹣4x=0.64

4x=0.64

4x÷4=0.64÷4

x=0.16.

(77)2x﹣0.24=0.12

2x﹣0.24+0.24=0.12+0.24

2x=0.36

2x÷2=0.36÷2

x=0.18.

(78)(3.8﹣2)x=14.4

1.8x=14.4

1.8x÷1.8=14.4÷1.8

x=8. 

(79)64﹣16X=56.8

64﹣16X+16X=56.8+16X

16X+56.8=64

16X+56.8﹣56.8=64﹣56.8

16X=7.2

16X÷16=7.2÷16

X=0.45;

(80)8.6X﹣2.6X=36.6

6X=36.6

6X÷6=36.6÷6

X=6.1;

(81)2.2(X+8)=22

2.2(X+8)÷2.2=22÷2.2

X+8=10

X+8﹣8=10﹣8

X=2;

(82)6×4﹣0.6X=6.36

24﹣0.6X=6.36

24﹣0.6X+0.6X=6.36+0.6X

0.6X+6.36=24

0.6X+6.36﹣6.36=24﹣6.36

0.6X=17.64

0.6X÷0.6=17.64÷0.6

X=29.4 

(83)0.03×150﹣5x=3.2

4.5﹣5x=3.2,

4.5﹣5x+5x=3.2+5x,

4.5﹣3.2=3.2+5x﹣3.2,

1.3÷5=5x÷5,

x=0.26;

(84)45.3﹣4X=35.7,

45.3﹣4X+4X=35.7+4X,

35.7+4X=45.3,

35.7+4X﹣35.7=45.3﹣35.7,

4X=9.6,

4X÷4=9.6÷4,

X=2.4;

(85)3(5.4+X)÷6=7.2,

(3×5.4+3X)÷6×6=7.2×6,

16.2+3X=43.2,

16.2+3X﹣16.2=43.2﹣16.2,

3X=27,

3X÷3=27÷3,

X=9;

(86)5.9X+7=8.7X,

5.9X+7﹣7=8.7X﹣7,

5.9X=8.7X﹣7,

5.9X﹣5.9X=8.7X﹣7﹣5.9X,

2.8X﹣7=0,

2.8X﹣7+7=0+7,

2.8X=7,

2.8X÷2.8=7÷2.8,

X=2.5.

(87)3+0.6x=4.32

3+0.6x﹣3=4.32﹣3,

0.6x÷0.6=1.32÷0.6,

x=2.2;

(88)0.6(y﹣0.4)=6,

0.6(y﹣0.4)÷0.6=6÷0.6,

y﹣0.4+0.4=10+0.4,

y=10.4

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