25(x-y)的平方+10(y-x)+1因式分解
问题描述：
25(x-y)的平方+10(y-x)+1因式分解
答
25(x-y)^2+10(y-x)+1
=25(x-y)^2-10(x-y)+1
={5(x-y)-1}^2
=(5x-5y+1)^2