(10x+y)-(10y+x)=18 x=8-y
问题描述:
(10x+y)-(10y+x)=18 x=8-y
答
(10x+y)-(10y+x)=18 x=8-y
9x-9y=18
x-y=2
8-y-y=2
y=3
x=5