第1个回答 2011-12-25
解法为:x^2-(y+1)^2=(x+y+1)(x-y-1)
第2个回答 2011-12-25
x^2 -(y+1)^2
=(x+y+1)(x-y-1)本回答被提问者采纳
第3个回答 2011-12-25
X^2-Y^2-2Y-1
=x^2-(y^2+2y+1)
=x^2-(y+1)^2
=(x+y+1)(x-y-1)
第4个回答 2011-12-25
x^2-(y+1)^2=(x+y+1)(x-y-1)
第5个回答 2011-12-25
(x+y)(x-y)-(2y+1)