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3a²*a²+2a*a²*a²-4a²*a²
人气:211 ℃ 时间:2020-02-21 21:29:56
解答
3a²*a²+2a*a²*a²-4a²*a²
=3a^4+2a^5-4a^4
=2a^5-a^4
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