1.（1）5a+(2-4a)=0
5a+2-4a=0
a+2=0
a=-2
(2)25b-(b-5)=29
25b-b+5=29
24b=24
b=1
（3）7x+2(3x-3)=20
7x+6x-6=20
13x=26
x=2
(4)8y-3(3y+2)=6
8y-9y-6=6
-y=12
y=-12
2(1) 2(x+8)=3(x-1)
2x+16=3x-3
19=x
(2)8x=-2(x+4)
8x=-2x-8
10x=-8
x=-0.8
(3)2x-2/3(x+3)=-x+3
2x-2/3x-2=-x+3
7/3x=5
x=15/7
(4)2(10-0.5y)=-(1.5y+2)
20-y=-1.5y-2
0.5y=-22
y=-44
都是分?jǐn)?shù)就不抄題目了
3 (1)3（3x+5)=2(2x-1)
9x+15=4x-2
5x=-17
x=-17/5
(2)-3(x-3)=3x+4
-3x+9=3x+4
5=6x
x=5/6
(3)3(3y-1)-12=2(5y-7)
9y-3-12=10y-14
-1=y
(4)4(5y+4)+3(y-1)=24-5y+5
20y+16+3y-3=24-5y+5
y=4/7
真夠累的,大哥,看我這么辛苦有加分加幾分