x的2次方-2xy+y的2次方-2x+2y+1=?

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x的2次方-2xy+y的2次方-2x+2y+1=?x的2次方-2xy+y的2次方-2x+2y+1=?x的2次方-2xy+y的2次方-2x+2y+1=?x²-2xy+y²-2x+2y

x的2次方-2xy+y的2次方-2x+2y+1=?
x的2次方-2xy+y的2次方-2x+2y+1=?

x的2次方-2xy+y的2次方-2x+2y+1=?
x²-2xy+y²-2x+2y+1
=(x-y)²-2(x-y)+1
=(x-y)*(x-y-2)-1

(x-y-1)的平方

n cbxs

X^2-2XY+Y^2-2X+2y+1=(x-y)^2-2(x-y)+1=(x-y-1)^2
所以它=(x-y-1)的平方

x²-2xy+y²-2x+2y+1=(x-y)²-2(x-y)+1=(x-y+1)²

(x-y-1)的平方