(y+5)(x-2+y)+6=30求X+Y的值
问题描述:
(y+5)(x-2+y)+6=30求X+Y的值
答
(y+5)(x-2+y)+6=30
(y+5)(x+y)-2(y+5)=24
(y+5)(x+y)=24+2(y+5)
x+y=24/(y+5)+2