解方程:8(2x-1)-3(4x-5)=98(2x-1)-3(4x-5)=92y-1/3=2y+1/6-1 (“/”是分号)
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
8(2x-1)-3(4x-5)=9
16x-8-12x+15=9
4x=9-7
x= 0.5
2y-1/3=2y+1/6-1
两边同时乘以6得
4y-2= 2y+1-6
2y= -5+2
y = -1.5
答
①,16x-8-(12x-15)=9
16x-8-12x+15=9
4x+7=9
4x=2
x=1/2
②,2y-1/3=2y+1/6-1
两边×6:
2(2y-1)=2y+1-6
4y-2=2y-5
2y=-3
y=-3/2
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