已知 x-3y=0 求(2x+y)/(x²-2xy+y²)*(x-y)
问题描述:
已知 x-3y=0 求(2x+y)/(x²-2xy+y²)*(x-y)
有分……
答
x-3y=0
x=3y
(2x+y)/(x²-2xy+y²)*(x-y)
=(2x+y)/(x-y)
=(7y)/(2y)
=7/2