40道一元一次方程

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40道一元一次方程
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40道一元一次方程
40道一元一次方程

40道一元一次方程
1)12(2-3X)=4X+4
24-36X=4X+4
-40X=-20
X=1/2
(2)6-3(X+2/3)=2/3
6-3X-2=2/3
-3X=-10/3
X=10/9
(3)2(200-15X)=70+25X
400-30X=70+25X
-55X=-330
X=6
(4)3(2X+1)=12
6X+3=12
6X=9
X=3/2
(5)1/4X-1/2=3/4
(1/4)X=5/4
X=5
(6)7X-5/4 =3/8
7X=13/8
X=13/56
(7)2X-1/6 = 5X+1/8
-3X=7/24
X=-7/72
(8)(1/2)X-7 = 9X-2/6
-(17/2)X=20/3
X=-20/51
(9)(1/5)X-1/2(3-2X)=1
(1/5)X-3/2+X=1
(6/5)X=5/2
X=25/12
(10)2X+(1/3)-5X-(1/6)=1
-3X+(1/6)=1
-3X=5/6
X=-5/18
(11)1/7(2X+14)=4-2X
(2/7)X+2=4-2X
(16/7)X=2
X=7/8
(12)3/10(200+X)-2/10(300-X)=300*9/25
60+(3/10)X-60+(1/5)X=108
(1/2)X=108
X=216 x÷(18+2)+1.5=x÷(18-2)
x/20+1.5=x/16
4x+120=5x
x=120
2(X+3)=3(X-3) 2X+6=3X-9
X=15
3X+30=0.4X
0.3X-0.4X=-30
-0.1X=-30
X=300
;15X+45X=180
60X=180
X=3 3X-1·(50-X)=142
3X+X=142+5
4X=192
X=48
X+(X+2)=10
2X=8
X=4题:10 x + 90 = 290
10 x = 290-90
x= 200/10
x= 20
题:10 x + 90 = 300
10 x = 300-90
x= 210/10
x= 21
题:10 x + 90 = 310
10 x = 310-90
x= 220/10
x= 22
题:10 x + 91 = 321
10 x = 321-91
x= 230/10
x= 23
题:11 x + 93 = 324
11 x = 324-93
x= 231/11
x= 21
题:12 x + 99 = 375
12 x = 375-99
x= 276/12
x= 23
题:13 x + 91 = 455
13 x = 455-91
x= 364/13
x= 28
题:18 x + 93 = 471
18 x = 471-93
x= 378/18
x= 21
20%+(1-20%)(320-x)=320×40%
0.2+0.8*(320-x)=128
0.8*(320-x)=127.8
320-x=159.75
x=160.25
2(x-2)+2=x+1
2x-4+2=x+1
2x-2=x+1
x=3 2(x-2)-(3x-2)=-4
2x-4-3x+2=-4
-x-2=-4
-x=-2
x=215-(8-5x)=7x+(4-3x)
15-8+5x=7x+4-3x
7+5x=4x+4
x=-3 2x-3=x+1
x=4 4x-5x=6 x=-6
x/30+30=x/18
x=13503(x-2)+1=x-(2x-1)
3x-6+1=x-2x+1
3x-x+2x=1+6-1
4x=6
x=3/2
5(3-2x)-12(5-2x)=-17
15-10x-60-24x=-17
34x=-28
x=-14/17
3x-7(x-1)=3-2(x+3)
3x-7x+7=3-2x-6
3x-7x=2x=3-6-7
-2x=-10
x=5
2(x+8)=3(x-1)
2x+16=3x-3
2x-3x=-3-16
-x=-19
x=19 4/5X+X=(X+20)X6/5
X=40
6x+3+5=8x
2x=8
x=4 6x+8=7x-1
x=9
0.055x+0.045(20-x)=0.95
0.01x+0.9=0.95
x=5
5*18/60+5x=14x
4.5+5x=14x
9x=4.5
x=0.5
40道题时间原因没完整标题号,不要忘记写解,