小数方程专项练习附答案Word文件下载.docx
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(35)1.44÷
(36)2x+6=12.5
(37)2.5x﹣x=1.2
(38)(4.5+x)×
(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)×
(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
2x÷
8×
4=0.8×
x=3.2
3+2x=5
3+2x﹣3=5﹣3
2x÷
2=2÷
x=1
4.7x﹣1.9x=1.9x﹣1.9x+7
2.8x=7
2.8x÷
2.8=7÷
2.8
x=2.5
6.3×
(x+4.8)=63
(x+4.8)÷
6.3=63÷
6.3
x+4.8=10
x+4.8﹣4.8=10﹣4.8
x=5.2;
12.5+4x﹣12.5=21.7﹣12.5
4x÷
4=9.2÷
x=2.3
5x÷
5=20÷
5
x=4
6x﹣34=20
6x﹣34+34=20+34
6x÷
6=54÷
6
x=9
36÷
x×
x=0.4×
x
36=0.4×
0.4=0.4×
x÷
0.4
x=90;
(9.6﹣1)x=43
8.6x÷
8.6=43÷
8.5
x=5;
3x﹣3.6=46.2
3x﹣3.6+3.6=46.2+3.6
3x÷
3=49.8÷
3
x=16.6
3.5x﹣28=42
3.5x﹣28+28=42+28
3.5x=70
3.5x÷
3.5=70÷
3.5
x=20;
0.1x=81.9
0.1x÷
0.1=81.9÷
0.1
x=819;
3.8+5x﹣3.8=12.3﹣3.8
5x=8.5
5=8.5÷
x=1.7;
4(0.3+x)÷
4=6.8÷
0.3+x=1.7
0.3+x﹣0.3=1.7﹣0.3
x=1.4
6.4x=19.2,
6.4x÷
6.4=19.2÷
6.4,
x=3;
1.8×
1.8=1.62×
1.8,
x=2.916;
45+5x﹣45=135﹣45,
5=90÷
5,
x=18.
1.4x+9.8﹣9.8=22.4﹣9.8,
1.4x=12.6,
1.4x÷
1.4=12.6÷
1.4,
x=9;
2x﹣6=11.6,
2x﹣6+6=11.6+6,
2x=17.6,
2=17.6÷
2,
x=8.8;
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
12.8﹣5x+5x=2.3+5x
2.3+5x﹣2.3=12.8﹣2.3
5=10.5÷
x=2.1;
2.5x÷
20×
20=16×
20
2.5=320÷
2.5
x=128;
5.2x=41.6
5.2x÷
5.2=41.6÷
5.2
x=8;
x÷
0.5=97.2
0.5×
0.5=97.2×
0.5
x=48.6
5x﹣7.8+7.8=20.2+7.8,
5=28÷
x=5.6;
1.5x÷
1.5=1.8÷
1.5,
x=1.2;
(4.5+x)×
2÷
2=13÷
4.5+x﹣4.5=6.5﹣4.5,
x=2.
7x﹣18=80,
7x﹣18+18=80+18,
7x=98,
7x÷
7=98÷
7,
x=14;
(13﹣7.5)x=18.7,
5.5x=18.7,
5.5x÷
5.5=18.7÷
5.5,
x=3.4;
(x+12)×
6÷
6=108÷
6,
x+12=18,
x+12﹣12=18﹣12,
x=6.
4x+2.1=6.5
4x+2.1﹣2.1=6.5﹣2.1
4x=4.4
4=4.4÷
x=1.1
2x﹣1=1.6
2x﹣1+1=1.6+1
2x=2.6
2=2.6÷
x=1.3
7.02x=4.914
7.02x÷
7.02=4.914÷
7.02
x=0.7
1.44÷
0.4x=1.44
0.4x÷
0.4=1.44÷
x=3.6
2x+6﹣6=12.5﹣6
2=6.5÷
x=3.25;
1.5x=1.2
1.5=1.2÷
1.5
x=0.8;
2=63÷
4.5+x﹣4.5=31.5﹣4.5
x=27;
2x﹣25+25=15+25
2=40÷
x=20.
3.85+1.5x=6.1
3.85﹣3.85+1.5x=6.1﹣3.85
1.5x=2.25
1.5=2.25÷
x=1.5
13(x+2.5)÷
13=169÷
13
x+2.5=13
x+2.5﹣2.5=13﹣2.5
x=11.5
2x﹣0.2=3.6
2x+0.2﹣0.2=3.6+0.2
2x=3.8
2=3.8÷
x=1.9
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
3.8﹣2x+2x=3.6+2x
3.8﹣3.6=3.6+2x﹣3.6
0.2÷
2=2x÷
x=0.1;
7x÷
0.3×
0.3=4.2×
0.3
7=1.26÷
x=0.18;
10x﹣11+11=32.9+11
10x÷
10=43.9÷
10
x=4.39;
7(x﹣1.2)÷
7=2.87÷
x﹣1.2+1.2=0.41+1.2
x=1.61
2.4+3.4x﹣2.4=5.8﹣2.4
3.4x=3.4
3.4x÷
3.4=3.4÷
3.4
x=1;
5(x﹣1.2)÷
5=35÷
x﹣1.2=7
x﹣1.2+1.2=7+1.2
x=8.2;
2.5x+51=136
2.5x+51﹣51=136﹣51
2.5x=85
2.5=85÷
x=34.
4x=2.2
4=2.2÷
x=0.55;
8(x﹣6.2)÷
8=41.6÷
x﹣6.2+6.2=5.2+6.2
x=11.4.
0.5(x﹣0.5)÷
0.5=7.5÷
x﹣0.5=15
x﹣0.5+0.5=15+0.5
x=15.5;
(16x+1.5)÷
5×
5=5.1×
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
3=22.5÷
x=7.5
5x﹣3.36=1.04
5x﹣3.36+3.36=1.04+3.36
5x=4.4
5=4.4÷
x=0.88
10x=28.8
10=28.5÷
x=2.85
2.38x+9.8﹣9.8=33.6﹣9.8
2.38x÷
2.38=23.8÷
2.38
x=10
2(x﹣3)÷
2=10.6÷
x﹣3+3=5.3+3
x=8.3;
12x=14.4
12x÷
12=14.4÷
12
68﹣1.1x+1.1x=24+1.1x
68﹣24=24+1.1x﹣24
44÷
1.1=1.1x÷
1.1
x=40.
3(x+3.5)÷
3=21.6÷
x+3.5﹣3.5=7.2﹣3.5
x=3.7;
3x﹣54+54=136.5+54
3=190.5÷
x=63.5;
0.64x=3.2
0.64x÷
0.64=3.2÷
0.64
4x+11.2﹣11.2=19.32﹣11.2
4=8.12÷
x=2.03.
4x﹣5.2+5.2=5.2+5.2
4x=10.4
4=10.4÷
x=2.6;
7.4x=3.7
7.4x÷
7.4=3.7÷
7.4
x=0.5;
3x+12.8=50.3
3x+12.8﹣12.8=50.3﹣12.8
3x=37.5
3=37.5÷
x=12.5.
2.7x﹣1.8+1.8=1.2x+2.7+1.8,
2.7x﹣1.2x=1.2x+4.5﹣1.2x,
1.5=4.5÷
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,
7÷
x﹣0.7+0.7=1.3+0.7,
x=2×
x,
x=3.5;
(5.9+x)÷
3+16﹣16=30﹣16,
3×
3=14×
3,
5.9+x﹣5.9=42﹣5.9,
x=36.1.
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,
4=2.4÷
4,
x=0.6;
4x﹣2=9.6,
4x﹣2+2=9.6+2,
4x=11.6,
4=11.6÷
x=2.9.
2×
(x+1.7)÷
2=9.2÷
x+1.7=4.6
x+1.7﹣1.7=4.6﹣1.7
x=2.9.
4x=0.64
4=0.64÷
x=0.16.
2x﹣0.24+0.24=0.12+0.24
2x=0.36
2=0.36÷
x=0.18.
1.8x=14.4
1.8x÷
1.8=14.4÷
1.8
x=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÷
X=0.45;
6X=36.6
6X÷
6=36.6÷
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;
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
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÷
x=0.26;
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÷
X=2.4;
(3×
5.4+3X)÷
6×
6=7.2×
16.2+3X=43.2,
16.2+3X﹣16.2=43.2﹣16.2,
3X=27,
3X÷
3=27÷
X=9;
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,
X=2.5.
3+0.6x﹣3=4.32﹣3,
0.6x÷
0.6=1.32÷
0.6,
x=2.2;
0.6(y﹣0.4)÷
0.6=6÷
y﹣0.4+0.4=10+0.4,
y=10.4