因式分解:(a²-1)(b²-1)+4ab
人气:459 ℃ 时间:2019-10-02 22:20:04
解答
原式=a²b²-a²-b²+1+4ab
=(a²b²+2ab+1)-(a²-2ab+b²)
=(ab-1)²-(a-b)²
=(ab+a-b-1)(ab-a+b-1)
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