如题所述
第1个回答 2015-02-02
x²-2xy+y²-2x+2y+1
=(x²-2xy+y²)-(2x-2y)+1
=(x-y)² -2(x-y)+1
=(x-y-1)²本回答被网友采纳
=(x²-2xy+y²)-(2x-2y)+1
=(x-y)² -2(x-y)+1
=(x-y-1)²本回答被网友采纳
第2个回答 2015-02-02
=(x–y)²–2(x–y)+1
=(x–y)[(x–y)–2]+1
=(x–y)[(x–y)–2]+1
第3个回答 2015-02-02
(x一y一丨)2