计算:【(ab+1)(ab-1)-2a²b²+1】÷(-ab)
人气:346 ℃ 时间:2020-02-05 17:53:23
解答
【(ab+1)(ab-1)-2a²b²+1】÷(-ab)
=(a²b²-1-2a²b²+1)÷(-ab)
=(-2a²b²)÷(-ab)
=2ab
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