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
(1)(x+0.55)>4=3.6
(9)36乡=0.4
(2)2x^8=0.8
(10)9.6x-x=43
(3)1.5>+2x=5
(11)3x-4X0.9=46.2
(4)4.7x=1.9x+7
(12)3.5x-4X7=42
(5)12.6(x+4.8)吃=63
(13)x-0.9x=81.9
(6)12.5+4x=21.7
(14)3.8+5x=12.3
(7)13.5x-8.5x=20
(16)8x-1.6x=19.2
(25)xP.5=48.6>
(17)xT8=1.62
(26)5X-7.8=20.2,
(18)22.5&+5x=135.
(27)2.5X-X=1.8,
(19)1.4x+9.8=22.4,
(28)(4.5+X)>2=13,
(20)2(x-3)=11.6,
(29)7x-2X9=80,
(21)68-4.4x=24,
(30)13x-7.5x=18.7,
(22)1.6>8-5x=2.3
(31)(x+12)0=108,
(23)2.5x-20=16
(24)6.2x-x=41.6
(33)2X(x-0.5)=1.6
(42)
2x-2+1.8=3.6
(34)
3xX2.34=4.914
(43)
7(x-1.2)=3.57
(35)
1.44*=0.4
(44)
2+1.8-2x=3.6
(36)
2x+6=12.5
(45)
7x*0.3=4.2
(37)
2.5x-x=1.2
(46)
6x+4x-1仁32.9
(38)
(4.5+x)>2=63
(47)
7(x-1.2)=2.87
(39)
2x-2.5>0=15
(48)
2.4+3.4x=5.8
(40)
3.85+1.5x=6.1
(49)
5(x-1.2)=35
(41)13(x+2.5)=169
(50)2.5X+5仁17X8
(59)2(x-3)=10.6
(51)2.4x+1.6x=2.2
(60)13x-x=14.4
(52)8(x-6.2)=41.6
(61)68-1.1x=24
(53)0.5(x-0.5)=7.5
(62)3(x+3.5)=21.6
(54)(9x+1.5+7x)弋=5.1
(63)3x-54=136.5
(55)3x+7=29.5
(64)x-0.36x=3.2
(56)5x-2.8>1.2=1.04
(65)4x+2.8>4=19.32
(57)4x+6x=28.5
(67)4.8x+2.6x=3.7
(76)8x-4x=0.64
(68)3x+6.4>2=50.3
(77)2x-0.24=0.12
(69)2.7x-1.8=1.2x+2.7,
(78)(3.8-2)x=14.4
(70)8-5(6x+0.7)=10x+0.5,
(79)64-16X=56.8
(71)7畝-0.7=1.3,
(80)8.6X-2.6X=36.6
(72)(5.9+x)£+16=30,
(82)6>4-0.6X=6.36
(73)0.56>-4x=0.4,
(83)0.03>50-5x=3.2
(74)4(x-0.5)=9.6,
(84)45.3-4X=35.7,
(86)5.9X+7=8.7X,
(88)0.6(y—0.4)=6,
小数方程88题参考答案:
(1)(x+0.55)X4=3.6
(x+0.5)M韶=3.6呜
x+0.5=0.9
x+0.5—0.5=0.9—0.5
x=0.4
(2)2xP=0.8
2x£>4=0.84
x=3.2
(3)1.54+2x=5
3+2x=5
3+2x—3=5—3
2x吃=2吃
x=1
(4)4.7x=1.9x+74.7x—1.9x=1.9x—1.9x+7
2.8x=7
2.8x2.8=72.8
x=2.5
(5)12.6(x+4.8)22=63
6.3(x+4.8)=63
6.3(x+4.8)26.3=636.3
x+4.8=10
x+4.8—4.8=10—4.8
x=5.2;
12.5+4x=21.7
4x-4=9.2-4
x=2.3
(7)13.5x-8.5x=20
5x为=20为
x=4
(8)6x-8.5冶=20
6x-34=20
6x-34+34=20+34
6x.6=54七
x=9
(9)36乡=0.4
36-x为<=0.4X
36=0.4X
36弋.4=0.4x—).4
x=90;
(10)9.6x-x=43(9.6-1)x=438.6x—.6=43—.5
x=5;
(11)3x-4X0.9=46.2
3x-3.6=46.2
3x-3.6+3.6=46.2+3.6
3x-3=49.83
x=16.6
(12)3.5x-4X7=42
3.5x-28=42
3.5x-28+28=42+28
3.5x=70
3.5x3.5=703.5x=20;
(13)x-0.9x=81.9
0.1x=81.9
0.1x0.仁81.90.1x=819;
(14)3.8+5x=12.3
3.8+5x—3.8=12.3—3.8
5x=8.5
5x-5=8.55x=1.7;
(15)4(0.3+x)=6.8
4(0.3+x)-4=6.840.3+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,
6.4x6.4=19.26.4,
x=3;
(17)x—1.8=1.62
x-1.8X.8=1.62X8,
x=2.916;
(18)22.5X+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,
1.4x1.4=12.6他,x=9;
(20)2(x-3)=11.6,
2x-6=11.6,
2x-6+6=11.6+6,
2x=17.6,
2x-2=17.62,
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,
4.4x4.4=444.4,
x=10
(22)1.6X-5x=2.3
12.8-5x+5x=2.3+5x
2.3+5x-2.3=12.8-2.3
5x-5=10.55
x=2.1;
(23)2.5x-20=16
2.5x20X0=16X20
2.5x乞.5=3202.5
x=128;
(24)6.2x-x=41.6
5.2x=41.6
5.2x5.2=41.652
x=8;
(25)xP.5=48.6鬼
x弋.5=97.2
x-M0.5®.5=97.20.5
x=48.6
(26)5X-7.8=20.2,
5x-7.8+7.8=20.2+7.8,
5x弋=28P,
x=5.6;
(27)2.5X-X=1.8,
1.5x壬5=1.8侥,x=1.2;
(28)(4.5+X)>2=13,
(4.5+x)>吃=13吃,
4.5+x-4.5=6.5-4.5,
x=2.
(29)7x-2X9=80,
7x-18=80,
7x-18+18=80+18,7x=98,
7xT=98£,x=14;
(30)13x-7.5x=18.7,
(13-7.5)x=18.7,
5.5x=18.7,
5.5x5\5=18.75.5,
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+3X0.7=6.5
4x+2.1=6.54x+2.1-2.1=6.5-2.14x=4.4
4x-4=4.4—
x=1.1
(33)2X(x-0.5)=1.6
2x-1=1.6
2x-1+1=1.6+1
2x=2.6
2x-2=2.6乞
x=1.3
(34)3x>2.34=4.914
7.02x=4.914
7.02x7.02=4.9147t02
x=0.7
(35)1.44-x=0.4
1.44x>k=0.4X
0.4x=1.44
0.4x0.4=1.4404
x=3.6
(36)2x+6=12.5
2x+6-6=12.5-6
2x-2=6.52x=3.25;
(37)2.5x-x=1.2
1.5x=1.2
1.5x1.5=1.2侥
x=0.8;
(38)(4.5+x)>2=63
(4.5+x)X2-2=63-24.5+x-4.5=31.5-4.5x=27;
(39)2x-2.5>0=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
1.5x1.5=2.2515
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=3.82
x=1.9
(43)7(x-1.2)=3.57
7(x-1.2)T=3.57子
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
0.22=2x吃
x=0.1;
(45)7xP.3=4.2
7x电303=4.20.3
7x-7=1.267
x=0.18;
(46)6x+4x—11=32.9
10x—11+11=32.9+11
10x-10=43.910
x=4.39;
(47)7(x—1.2)=2.87
7(x—1.2)-7=2.877
x—1.2+1.2=0.41+1.2x=1.61
(48)2.4+3.4x=5.82.4+3.4x—2.4=5.8—2.4
3.4x=3.4
3.4x3.4=3.434
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=17X8
2.5x+51=136
2.5x+51—51=136—51
2.5x=85
2.5x2.5=852.5
x=34.
(51)2.4x+1.6x=2.2
4x=2.2
4x-4=2.24
(52)8(x—6.2)=41.6
8(x—6.2)-8=41.68
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=7.505
x—0.5=15
x—0.5+0.5=15+0.5x=15.5;
(54)(9x+1.5+7x)-5=5.1
(16x+1.5)-5=5.1
(16x+1.5)-5X5=5.1316x+1.5=25.516x+1.5—1.5=25.5—1.516x=24
16x-16=24-16x=1.5;
(55)3x+7=29.5
3x+7—7=29.5—7
3x=22.5
3x-3=22.53
x=7.5
(56)5x—2.8X.2=1.04
5x—3.36=1.04
5x—3.36+3.36=1.04+3.36
5x=4.4
5x-5=4.45
x=0.88
(57)4x+6x=28.5
10x=28.8
10x-10=28.510
x=2.85
(58)2.38x+9.8=33.62.38x+9.8—9.8=33.6—9.8
2.38x2.38=23.82^38
x=10
(59)2(x—3)=10.6
2(x—3)-2=10.62
x—3+3=5.3+3
x=8.3;
(60)13x—x=14.4
2.7x-1.8+1.8=1.2x+2.7+1.8,
12x=14.4
12x勻2=14.44-2
x=1.2;
(61)68-1.1x=24
68-1.1x+1.1x=24+1.1x
68-24=24+1.1x-24
44£.仁1.1x1.1x=40.
(62)3(x+3.5)=21.6
3(x+3.5)£=21.64x+3.5—3.5=7.2—3.5x=3.7;
(63)3x-54=136.5
3x-54+54=136.5+54
3x43=190.53
x=63.5;
(64)x-0.36x=3.2
0.64x=3.2
0.64x0.64=3.2064
x=5;
(65)4x+2.8>4=19.32
4x+11.2-11.2=19.32-11.2
4x-4=8.124
x=2.03.
(66)4x-5.2=5.2
4x-5.2+5.2=5.2+5.2
4x=10.4
4x-4=10.44
x=2.6;
(67)4.8x+2.6x=3.7
7.4x=3.7
7.4x7.4=3.774
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=37.53
x=12.5.
(69)2.7x-1.8=1.2x+2.7,
2.7x-1.2x=1.2x+4.5-1.2x,
1.5x1.5=4.515,
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><=2>,
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)-3X3=14X3,
5.9+x-5.9=42-5.9,x=36.1.
(73)0.56X-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=11.64,
x=2.9.
(75)2X(x+1.7)=9.2
2X(x+1.7)吃=9.2-
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—
x=0.16.
16.2,
(77)2x-0.24=0.12
2x-0.24+0.24=0.12+0.24
2x=0.36
2x£=0.36舍x=0.18.
(78)(3.8-2)x=14.4
1.8x=14.4
1.8x壬8=14.418
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=7.246
X=0.45;
(80)8.6X-2.6X=36.6
6X=36.6
6X-6=36.6&
X=6.1;
(81)2.2(X+8)=22
2.2(X+8)42.2=222.2
X+8=10
X+8-8=10-8
X=2;
(82)6X4-0.6X=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=17.6406
X=29.4
(83)0.03X50-5x=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=5x45,x=0.26;
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,
(3X5.4+3X)为0=7.2>6,
16.2+3X=43.2,
16.2+3X-16.2=43.2-
3X=27,
3X-3=27七,
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-.8=7-.8,
X=2.5.
(87)3+0.6x=4.32
3+0.6x-3=4.32-3,
0.6x4.6=1.320.6,
x=2.2;
(88)0.6(y-0.4)=6,
0.6(y-0.4)-—).6=64.6,y-0.4+0.4=10+0.4,y=10.4
(84)45.3-4X=35.7,
45.3-4X+4X=35.7+4X,