x2+2xy+y2x2y+xy2−x2−2xy+y2x2y−xy2.
问题描述:
−
x2+2xy+y2
x2y+xy2
.
x2−2xy+y2
x2y−xy2
答
原式=
-(x+y)2
xy(x+y)
,(x−y)2
xy(x−y)
=
-x+y xy
,x−y xy
=
,x+y−x+y xy
=
,2y xy
=
.2 x
答案解析:首先把分式的分子分母分解因式,然后先约分再进行减法运算即可.
考试点:分式的加减法.
知识点:此题主要考查了分式的加减运算,关键是正确的把分子分母分解因式,进行约分.