(x+y-2xy)(x+y-2)+(xy-1)求高手帮忙分解因式
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(x+y-2xy)(x+y-2)+(xy-1)2
=(x+y)2-2xy(x+y)-2(x+y)+4xy+x2y2-2xy+1
=(x+y)2-2(x+y)(xy+1)+(xy+1)2
=(x+y-xy-1)2
=(x-1)2•(y-1)2.
=(x-1)2•(y-1)2
应该是这样吧,也不知道对不对,求采纳!
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很简单的 乖乖展开就好(字母后、字母之间的2为平方)
=x2+y2+7xy-2x-2y-2x2y-2xy2-1
=(x+y)2-2xy(x+y)-2(x+y)+4xy+x2y2-2xy+1
=(x+y)2-2(x+y)(xy+1)+(xy+1)2
=(x+y-xy-1)2
=(x-1)2•(y-1)2.
=x2+y2+7xy-2x-2y-2x2y-2xy2-1
=(x+y)2-2xy(x+y)-2(x+y)+4xy+x2y2-2xy+1
=(x+y)2-2(x+y)(xy+1)+(xy+1)2
=(x+y-xy-1)2
=(x-1)2•(y-1)2.
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:(x+y-2xy)(x+y-2)+(xy-1)2
=(x+y)2-2xy(x+y)-2(x+y)+4xy+x2y2-2xy+1
=(x+y)2-2(x+y)(xy+1)+(xy+1)2
=(x+y-xy-1)2
=(x-1)2•(y-1)2.
故答案为(x-1)2•(y-1)2
=(x+y)2-2xy(x+y)-2(x+y)+4xy+x2y2-2xy+1
=(x+y)2-2(x+y)(xy+1)+(xy+1)2
=(x+y-xy-1)2
=(x-1)2•(y-1)2.
故答案为(x-1)2•(y-1)2
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原式=(x+y)^2-2(x+y)(xy+1)+4xy+xy-1
=x^2+2xy+y^2-2x^2*y-2x*y^2-2x-2y+5xy-1
=x^2+y^2-2x^2*y-2y^2*x+7xy-2x-2y-1
=x^2+2xy+y^2-2x^2*y-2x*y^2-2x-2y+5xy-1
=x^2+y^2-2x^2*y-2y^2*x+7xy-2x-2y-1
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