化简[x-y+4xy/(x-y)][x+y-4xy/(x-y)]
问题描述：
化简[x-y+4xy/(x-y)][x+y-4xy/(x-y)]
答
原式={x-[y-4xy/(x-y)]}{x+[y-4xy(x-y)]}
=x²-[y-4xy(x-y)]
=x²-y+4xy(x-y)
=x²-y+4x²y-4xy²第二步中[y-4xy(x-y)]要加上平方吧哦对原式=={x-[y-4xy/(x-y)]}{x+[y-4xy(x-y)]}=x²-[y-4xy(x-y)]² =x²- [y²-8xy(x-y)+16x²y²（x-y）²] =x²-y²+8xy(x-y)-16x²y²(x-y)²剩下的实在懒的输了呵呵