问题
填空题
因式分-x2+2xy+y2=______.
答案
∵-x2+2xy+y2
=-(x2-2xy-y2)
=-(x2-y2-2xy)
=-[(x-y)2-(
y)2]2
=-(x-y+
y)(x-y-2
y).2
故答案为:-(x-y+
y)(x-y-2
y).2
因式分-x2+2xy+y2=______.
∵-x2+2xy+y2
=-(x2-2xy-y2)
=-(x2-y2-2xy)
=-[(x-y)2-(
y)2]2
=-(x-y+
y)(x-y-2
y).2
故答案为:-(x-y+
y)(x-y-2
y).2