将分式49-x²/(x-7)(x-1)约分分母是(x-7)(x-1)!

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将分式49-x²/(x-7)(x-1)约分分母是(x-7)(x-1)!

将分式49-x²/(x-7)(x-1)约分分母是(x-7)(x-1)!
将分式49-x²/(x-7)(x-1)约分
分母是(x-7)(x-1)!

将分式49-x²/(x-7)(x-1)约分分母是(x-7)(x-1)!
49-x²/(x-7)(x-1)=〔(x+7)(x-7)〕/〔(x-7)(x-1)〕=(x+7)/(x-1)

(7+X)/(X-1)

原式=(7+x)(7-x)/(x-7)(x+7)
=7-x/x-7
=-1