因式分解4(1-b²-ab)-a²
人气:285 ℃ 时间:2020-04-22 13:36:58
解答
原式=4-4b²-4ab-a²
=4-(4b²+4ab+a²)
=4-(2b+a)²
=[2-(2b+a)]*[2+(2b+a)]
=(2-a-2b)(2+a+2b)
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