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(-2/3a)(1/2a^2+1/6a+1/4)
人气:138 ℃ 时间:2020-07-05 03:22:07
解答
(-2/3a)(1/2a^2+1/6a+1/4)
=(-2/3a)*1/2a^2+(-2/3a)*1/6a+(-2/3a)*1/4
=-1/3a^3-1/9a^2-1/6a
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