x+2y+x-2y分之4y平方+4y平方-x平方之4x平方y ,过程!
问题描述：
x+2y+x-2y分之4y平方+4y平方-x平方之4x平方y ,过程!
答
=[(x+2y)(x-2y)+4y²]/(x-2y)-4x²y/ (x+2y)(x-2y)=x²/(x-2y)-4x²y/(x+2y)(x-2y)=(x³+2x²y-4x²y)/(x+2y)(x-2y)=x²/(x+2y)(4y²-x²)=-(x+2y)(x-2y)