x+2y分之x-y÷x2+4xy+4y2分之x2-y2

问题描述:

x+2y分之x-y÷x2+4xy+4y2分之x2-y2

x+2y分之x-y÷x2+4xy+4y2分之x2-y2
=(x-y)/(x+2y)* (x+2y)²/[(x+y)(x-y)]
=(x+2y)/(x+y)