解:(x^2-y^2)-(x-y)^2
= (x+y)(x-y)-(x-y)^2 【平方差公式】
=(x-y)[(x+y)-(x-y)] 【提取公因式】
=(x-y)(x+y-x+y) 【去括号】
=2y(x-y) 【合并同类项】孝搏迟
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分解因式:(x^2-y^2)-(x-y)^2
=x^2-y^2-x^2+2xy-y^2
=-2y^2+2xy
=-2y(y-x)
2y(x-y)