计算 (-2ab)^3(5a^2b-1/2ab^2+1/4b^3)
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计算(-2ab)^3(5a^2b-1/2ab^2+1/4b^3)计算(-2ab)^3(5a^2b-1/2ab^2+1/4b^3)计算(-2ab)^3(5a^2b-1/2ab^2+1/4b^3)(-2a
计算 (-2ab)^3(5a^2b-1/2ab^2+1/4b^3)
计算 (-2ab)^3(5a^2b-1/2ab^2+1/4b^3)
计算 (-2ab)^3(5a^2b-1/2ab^2+1/4b^3)
(-2ab)^3(5a^2b - 1/2 ab^2 + 1/4 b^3)
= -8a^3b^3(5a^2b - 1/2 ab^2 + 1/4 b^3)
= (-8a^3b^3)× (5a^2b) - ( -8a^3b^3)×(1/2 ab^2) + (-8)a^3b^3) ×(1/4b^3)
= - 40 a^5b^4 + 4a^4b^5 - 2a^3b^6
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