暑假作业因式分解(x+y-2xy)(x+y)+(xy-1)2急,最后的2是（xy-1)的平方的意识变成(x+y-2xy)(x+y-2)+(xy-1)2
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暑假作业因式分解(x+y-2xy)(x+y)+(xy-1)2急,最后的2是（xy-1)的平方的意识变成(x+y-2xy)(x+y-2)+(xy-1)2暑假作业因式分解(x+y-2xy)(x+y)+(x
暑假作业因式分解(x+y-2xy)(x+y)+(xy-1)2急,最后的2是（xy-1)的平方的意识变成(x+y-2xy)(x+y-2)+(xy-1)2
暑假作业因式分解(x+y-2xy)(x+y)+(xy-1)2
急,最后的2是（xy-1)的平方的意识
变成(x+y-2xy)(x+y-2)+(xy-1)2
暑假作业因式分解(x+y-2xy)(x+y)+(xy-1)2急,最后的2是（xy-1)的平方的意识变成(x+y-2xy)(x+y-2)+(xy-1)2
x+y-2XY)(x+y-2)+(xy-1)^2
=[（x+y)-2xy][(x+y)-2]+(xy-1)^2
=(x+y)^2-2(xy+1)(x+y)+4xy+x^2y^2-2xy+1
=(x+y)^2-2(xy+1)(x+y)+x^2y^2+2xy+1
=(x+y)^2-2(xy+1)(x+y)+(xy+1)^2
=[(x+y)-(xy+1)]^2
=(x+y-xy-1)^2
=[x(1-y)-(1-y)]^2
=(x-1)^2(1-y)^2
=(x-1)^2(y-1)^2
x的平方+2xy+y的平方-2(x的平方）y-2x（y的平方）-x的平方y的平方+2xy-1
(x+y)(x+y)-2xy(x+y)+(x-y)(x-y)
暑假作业因式分解(x+y-2xy)(x+y)+(xy-1)2急,最后的2是（xy-1)的平方的意识变成(x+y-2xy)(x+y-2)+(xy-1)2
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