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.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+)×4=
(2)2x÷8=
(3)×2+2x=5
(4)=+7
(5)(x+)÷2=63
(6)+4x=
(7)﹣=20
(8)6x﹣×4=20
(9)36÷x=
(10)﹣x=43
(11)3x﹣4×=
(12)﹣4×7=42
(13)x﹣=
(14)+5x=
(15)4(+x)=
(16)8x﹣=
(17)x÷=
(18)×2+5x=135,
(19)+=,
(20)2(x﹣3)=,
(21)68﹣=24,
(22)×8﹣5x=
(23)÷20=16
(24)﹣x=
(25)x÷=×2
(26)5X﹣=,
(27)﹣X=,
(28)(+X)×2=13,
(29)7x﹣2×9=80,
(30)13x﹣=,
(31)(x+12)×6=108,
(32)4x+3×=
(33)2×(x﹣)=
(34)3x×=
(35)÷x=
(36)2x+6=
(37)﹣x=
(38)(+x)×2=63
(39)2x﹣×10=15
(40)+=
(41)13(x+)=169
(42)2x﹣2+=
(43)7(x﹣)=
(44)2+﹣2x=
(45)7x÷=
(46)6x+4x﹣11=
(47)7(x﹣)=
(48)+=
(49)5(x﹣)=35
(50)+51=17×8
(51)+=
(52)8(x﹣)=
(53)(x﹣)=
(54)(9x++7x)÷5=
(55)3x+7=
(56)5x﹣×=
(57)4x+6x=
(58)+=
(59)2(x﹣3)=
(60)13x﹣x=
(61)68﹣=24
(62)3(x+)=
(63)3x﹣54=
(64)x﹣=
(65)4x+×4=
(66)4x﹣=
(67)+=
(68)3x+×2=
(69)﹣=+,
(70)8﹣5(6x+)=10x+,
(71)7÷x﹣=,
(72)(+x)÷3+16=30,
(73)×5﹣4x=,
(74)4(x﹣)=,
(75)2×(x+)=
(76)8x﹣4x=
(77)2x﹣=
(78)(﹣2)x=
(79)64﹣16X=
(80)﹣=
(82)6×4﹣=
(83)×150﹣5x=
(84)﹣4X=,
(85)3(+X)÷6=,
(86)+7=,
(87)3+=
(88)(y﹣)=6,
小数方程88题参考答案:
(1)(x+)×4=
(x+)×4÷4=÷4
x+=
x+﹣=﹣
x=
(2)2x÷8=
2x÷8×4=×4
x=
(3)×2+2x=5
3+2x=5
3+2x﹣3=5﹣3
2x÷2=2÷2
x=1
(4)=+7
﹣=﹣+7
=7
÷=7÷
x=
(5)(x+)÷2=63
×(x+)=63
×(x+)÷=63÷
x+=10
x+﹣=10﹣
x=;
(6)+4x=
+4x﹣=﹣
4x÷4=÷4
x=
(7)﹣=20
5x÷5=20÷5
x=4
(8)6x﹣×4=20
6x﹣34=20
6x﹣34+34=20+34
6x÷6=54÷6
x=9
(9)36÷x=
36÷x×x=×x
36=×x
36÷=×x÷
x=90;
(10)﹣x=43
(﹣1)x=43
÷=43÷
x=5;
(11)3x﹣4×=
3x﹣=
3x﹣+=+
3x÷3=÷3
x=
(12)﹣4×7=42
﹣28=42
﹣28+28=42+28
=70
÷=70÷
x=20;
(13)x﹣=
=
÷=÷
x=819;
(14)+5x=
+5x﹣=﹣
5x=
5x÷5=÷5
x=;
(15)4(+x)=
4(+x)÷4=÷4
+x=
+x﹣=﹣
x=
(16)8x﹣=
=,
÷=÷,
x=3;
(17)x÷=
x÷×=×,
x=;
(18)×2+5x=135,
45+5x﹣45=135﹣45,
5x÷5=90÷5,
x=18.
(19)+=,
+﹣=﹣,
=,
÷=÷,
x=9;
(20)2(x﹣3)=,
2x﹣6=,
2x﹣6+6=+6,
2x=,
2x÷2=÷2,
x=;
(21)68﹣=24,
68﹣+=24+,
24+=68,
24+﹣24=68﹣24,
=44,
÷=44÷,
x=10
(22)×8﹣5x=
﹣5x+5x=+5x
+5x﹣=﹣
5x÷5=÷5
x=;
(23)÷20=16
÷20×20=16×20
÷=320÷
x=128;
(24)﹣x=
=
÷=÷
x=8;
(25)x÷=×2
x÷=
x÷×=×
x=
(26)5X﹣=,
5x﹣+=+,
5x÷5=28÷5,
x=;
(27)﹣X=,
÷=÷,
x=;
(28)(+X)×2=13,
(+x)×2÷2=13÷2,
+x﹣=﹣,
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﹣=,
(13﹣)x=,
=,
÷=÷,
x=;
(31)(x+12)×6=108,
(x+12)×6÷6=108÷6,
x+12=18,
x+12﹣12=18﹣12,
x=6.
(32)4x+3×=
4x+=
4x+﹣=﹣
4x=
4x÷4=÷4
x=
(33)2×(x﹣)=
2x﹣1=
2x﹣1+1=+1
2x=
2x÷2=÷2
x=
(34)3x×=
=
÷=÷
x=
(35)÷x=
÷x×x=×x
=
÷=÷
x=
(36)2x+6=
2x+6﹣6=﹣6
2x÷2=÷2
x=;
(37)﹣x=
=
÷=÷
x=;
(38)(+x)×2=63
(+x)×2÷2=63÷2
+x﹣=﹣
x=27;
(39)2x﹣×10=15
2x﹣25+25=15+25
2x÷2=40÷2
x=20.
(40)+=
+=
﹣+=﹣
=
÷=÷
x=
(41)13(x+)=169
13(x+)÷13=169÷13
x+=13
x+﹣=13﹣
x=
(42)2x﹣2+=
2x﹣=
2x+﹣=+
2x=
2x÷2=÷2
x=
(43)7(x﹣)=
7(x﹣)÷7=÷7
x﹣=
x+﹣=+
x=
(44)2+﹣2x=
﹣2x+2x=+2x
﹣=+2x﹣
÷2=2x÷2
x=;
(45)7x÷=
7x÷×=×
7x÷7=÷7
x=;
(46)6x+4x﹣11=
10x﹣11+11=+11
10x÷10=÷10
x=;
(47)7(x﹣)=
7(x﹣)÷7=÷7
x﹣+=+
x=
(48)+=
+﹣=﹣
=
÷=÷
x=1;
(49)5(x﹣)=35
5(x﹣)÷5=35÷5
x﹣=7
x﹣+=7+
x=;
(50)+51=17×8
+51=136
+51﹣51=136﹣51
=85
÷=85÷
x=34.
(51)+=
4x=
4x÷4=÷4
x=;
(52)8(x﹣)=
8(x﹣)÷8=÷8
x﹣+=+
x=.
(53)(x﹣)=
(x﹣)÷=÷
x﹣=15
x﹣+=15+
x=;
(54)(9x++7x)÷5=
(16x+)÷5=
(16x+)÷5×5=×5
16x+=
16x+﹣=﹣
16x=24
16x÷16=24÷16
x=;
(55)3x+7=
3x+7﹣7=﹣7
3x=
3x÷3=÷3
x=
(56)5x﹣×=
5x﹣=
5x﹣+=+
5x=
5x÷5=÷5
x=
(57)4x+6x=
10x=
10x÷10=÷10
x=
(58)+=
+﹣=﹣
÷=÷
x=10
(59)2(x﹣3)=
2(x﹣3)÷2=÷2
x﹣3+3=+3
x=;
(60)13x﹣x=
12x=
12x÷12=÷12
x=;
(61)68﹣=24
68﹣+=24+
68﹣24=24+﹣24
44÷=÷
x=40.
(62)3(x+)=
3(x+)÷3=÷3
x+﹣=﹣
x=;
(63)3x﹣54=
3x﹣54+54=+54
3x÷3=÷3
x=;
(64)x﹣=
=
÷=÷
x=5;
(65)4x+×4=
4x+﹣=﹣
4x÷4=÷4
x=.
(66)4x﹣=
4x﹣+=+
4x=
4x÷4=÷4
x=;
(67)+=
=
÷=÷
x=;
(68)3x+×2=
3x+=
3x+﹣=﹣
3x=
3x÷3=÷3
x=.
(69)﹣=+,
﹣+=++,
﹣=+﹣,
÷=÷,
x=3;
(70)8﹣5(6x+)=10x+,
8﹣30x﹣=10x+,
﹣30x+30x=10x++30x,
﹣=40x﹣,
4÷40=40x÷40,
x=;
(71)7÷x﹣=,
7÷x﹣+=+,
7÷x×x=2×x,
7÷2=2x÷2,
x=;
(72)(+x)÷3+16=30,
(+x)÷3+16﹣16=30﹣16,
(+x)÷3×3=14×3,
+x﹣=42﹣,
x=.
(73)×5﹣4x=,
﹣4x=,
﹣4x+4x=+4x,
+4x=,
+4x﹣=﹣,
4x=,
4x÷4=÷4,
x=;
(74)4(x﹣)=,
4x﹣2=,
4x﹣2+2=+2,
4x=,
4x÷4=÷4,
x=.
(75)2×(x+)=
2×(x+)÷2=÷2
x+=
x+﹣=﹣
x=.
(76)8x﹣4x=
4x=
4x÷4=÷4
x=.
(77)2x﹣=
2x﹣+=+
2x=
2x÷2=÷2
x=.
(78)(﹣2)x=
=
÷=÷
x=8.
(79)64﹣16X=
64﹣16X+16X=+16X
16X+=64
16X+﹣=64﹣
16X=
16X÷16=÷16
X=;
(80)﹣=
6X=
6X÷6=÷6
X=;
(81)(X+8)=22
(X+8)÷=22÷
X+8=10
X+8﹣8=10﹣8
X=2;
(82)6×4﹣=
24﹣=
24﹣+=+
+=24
+﹣=24﹣
=
÷=÷
X=
(83)×150﹣5x=
﹣5x=,
﹣5x+5x=+5x,
﹣=+5x﹣,
÷5=5x÷5,
x=;
(84)﹣4X=,
﹣4X+4X=+4X,
+4X=,
+4X﹣=﹣,
4X=,
4X÷4=÷4,
X=;
(85)3(+X)÷6=,
(3×+3X)÷6×6=×6,
+3X=,
+3X﹣=﹣,
3X=27,
3X÷3=27÷3,
X=9;
(86)+7=,
+7﹣7=﹣7,
=﹣7,
﹣=﹣7﹣,
﹣7=0,
﹣7+7=0+7,
=7,
÷=7÷,
X=.
(87)3+=
3+﹣3=﹣3,
÷=÷,
x=;
(88)(y﹣)=6,
(y﹣)÷=6÷,
y﹣+=10+,
y=
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