x+2y+(4y^2)/(x-2y)+(4x^2y)/(4y^2-x^2)
问题描述：
x+2y+(4y^2)/(x-2y)+(4x^2y)/(4y^2-x^2)
答
x+2y+[(4y^2)/(x-2y)]+[(4x^2y)/(4y^2-x^2)] 原式=(把前两个局部通分)[(x+2y)(x-2y)+4y^2]/(x-2y)+4x^2y/(2y+x)(2y-x) =(前两个局部计算) x^2/(x-2y)-4x^2y/(x+2y)(x-2y):[注意最后一项的分母变成了：x-2y,所以前面...