分解因式x²-y²-x+y=?a²-2ab+b²-1=?
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分解因式x²-y²-x+y=?a²-2ab+b²-1=?
分解因式x²-y²-x+y=?a²-2ab+b²-1=?
分解因式x²-y²-x+y=?a²-2ab+b²-1=?
x²-y²-x+y
=(x+y)(x-y)-(x-y)
=(x+y-1)(x-y)
a²-2ab+b²-1
=(a-b)²-1
=(a-b+1)(a-b-1)
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