计算(x+y-1)^2
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计算(x+y-1)^2计算(x+y-1)^2计算(x+y-1)^2解;(x+y-1)^2=〔(x+y)-1〕^2=(x+y)^2-2(x+y)+1^2=x^2+2xy+y^2-2x-2y+1
计算(x+y-1)^2
计算(x+y-1)^2
计算(x+y-1)^2
解;(x+y-1)^2
=〔(x+y)-1〕^2
=(x+y)^2-2(x+y)+1^2
=x^2+2xy+y^2-2x-2y+1
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