分解因式:x^2-2xy+y^2-9=?

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分解因式:x^2-2xy+y^2-9=?

分解因式:x^2-2xy+y^2-9=?
分解因式:x^2-2xy+y^2-9=?

分解因式:x^2-2xy+y^2-9=?
x^2-2xy+y^2-9
=(x-y)^2-9
=(x-y+3)(x-y-3)

x^2-2xy+y^2-9
=(x-y)^2-9
=(x-y+3)(x-y-3)

x^2-2xy+y^2-9 = (X-Y)^2 -9
= (X-Y+3) *(X-Y-3)

x^2-2xy+y^2-9
=(x-y)^2-9
=(x-y+3)(x-y-3)

x^2-2xy+y^2-9
=(x-y)^2-9
=(x-y+3)(x-y-3)

x^2-2xy+y^2-9
解:=(x-y)^2-9
=(x-y+3)(x-y-3)