分解因式x²-y²-3x-3y
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分解因式x²-y²-3x-3y分解因式x²-y²-3x-3y分解因式x²-y²-3x-3yx²-y²-3x-3y=x&#
分解因式x²-y²-3x-3y
分解因式x²-y²-3x-3y
分解因式x²-y²-3x-3y
x²-y²-3x-3y=x²-y²-3(x+y)
=(x+y)(x-y)-3(x+y)
=(x+y)[(x-y)-3]
=(x+y)(x-y-3)
原式=(x+y)(x-y)-3(x+y)
=(x+y)(x-y-3)
x²-y²-3x-3y
=(x²-y²)-(3x+3y)
=(x+y)(x-y)-3(x+y)
=(x+y)[(x-y)-3]
=(x+y)(x-y-3)