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数学
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(-2a^3+3a^2-4a)(-5a^5)
人气：493 ℃ 时间：2020-04-17 10:40:15
解答
(-2a^3+3a^2-4a)(-5a^5)
=-a(2a^2-3a+4)(-5a^5)
=5a^6(2a^2-3a+4)
=10a^8-15a^7+20a^4
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