(x四次方-8x二次方*y二次方+16y四次方)÷(2y+x)二次方÷(x-2y)
问题描述：
(x四次方-8x二次方*y二次方+16y四次方)÷(2y+x)二次方÷(x-2y)
答
(x^4-8x^2y^2+16y^4)/(2y+x)/(x-2y)
=(x^2-4y^2)^2/(x^2-4y^2)
=x^2-4y^2
=(x+2y)(x-2y)