x2-3xy+y2-9因式分解

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x2-3xy+y2-9因式分解x2-3xy+y2-9因式分解x2-3xy+y2-9因式分解x²-2xy+y²-9=(x²-2xy+y²)-9=(x-y)

x2-3xy+y2-9因式分解
x2-3xy+y2-9因式分解

x2-3xy+y2-9因式分解
x²-2xy+y²-9
=(x²-2xy+y²)-9
=(x-y)²-3²
=[(x-y)+3]×[(x-y)-3]
=(x-y+3)(x-y-3)