x^2+2xy+y^2分之4y^2-x^2除以2x^2+2xy分之x-2y
问题描述:
x^2+2xy+y^2分之4y^2-x^2除以2x^2+2xy分之x-2y
答
(4y^2-x^2)/(x^2+2xy+y^2)÷(x-2y)/( 2x^2+2xy)
=-(x+2y)(x-2y)/(x+y)^2 *【2x( x+y)】/(x-2y)
=-2x(x+2y)/(x+y)