8道一元一次方程题 写过程在纸上

8道一元一次方程题 写过程在纸上

8
(4)
3/2=2-(y+2)/5(200+x)-2/5(300-x)=5
3(200+x)-2(300-x)=25
600+3x-600+2x=25
5x=25
x=5
(5)
(2x-1)/6 -(5x-1)/6=1
(2x-1) -(5x-1)=6
2x-1 -5x+1=6
-3x=6
x=-2
(6)
(y-1)/.02 -7;5
5(y-1)=20-2(y+2)
5y-5=20-2y-4
7y=21
y=3
(7)
(4-6x)/0.01-6;2(x-1)=2-1/5(x+2)
5(x-1)=20-2(x+2)
5x-5=20 -2x-4
7x=21
x=3
(3)
2/7(x+7) =2(2-x)
2x+14 =28-14x
16x=14
x=7/0.5
400-600x+1=1-200x
400x=400
x=1
(8)
(2x-3)/2 +(x+2)/5=(7x-8)/(1)
(2x-1)/3 =(x+2)/4 -1
4(2x-1) =3(x+2) -12
8x-4 =3x+6 -12
5x=-2
x=-2/5
(2)
题目如是
1/2(x-1)-2 =1/5(x+2)
5(x-1)-20 =2(x+2)
5x-5-20 =2x+4
3x=29
x=29/3
题目如是
1/.5=(0.02-2x)/

题目 答案 3x+18=52 x=34/3 4y+11=22 y=11/4 3x*9=5 x=5/27 8z/6=48 z=36 3x+7=59 x=52/3 4y-69=81 y=75/4 8x*6=5 x=5/48 7z/9=4 y=63/7 15x+8-5x=54 x=4.6 5y*5=27 y=27/40 8x+2=10 x=1 x*8=88 x=11 y-90=1 y=91 2x-98=2 x=50 6x*6=12 x=1/3 5-6=5x x=-1/5 6*x=42 x=7 55-y=33 y=22 11*3x=60 x=20/11 8-y=2 y=-6