(-2/3a)(1/2a^2+1/6a+1/4)

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答案和解析

(-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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