小数方程计算专项练习题.docx
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小数方程计算专项练习题
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)