解方程:8(2x-1)-3(4x-5)=9
问题描述:
解方程:8(2x-1)-3(4x-5)=9
8(2x-1)-3(4x-5)=9
2y-1/3=2y+1/6-1 (“/”是分号)
答
(1)
8(2x-1)-3(4x-5)=9
16x-8-12x+15=9
16x-12x=9+8-15
4x=2
x=0.5
(2)
(2y-1)/3=(2y+1)/6-1
两边乘以6得
2(2y-1)=(2y+1)-6
4y-2=2y-5
4y-2y=2-5
2y=-3
y=-1.5