(1)2a²(3a²-5b)
=6a^4-10a²b
(2)(2/3ab²-2ab)*1/2ab
=1/3a²b³-a²b²
(3) (-4x²)(3x+1)
=-12x³-4x²
(1)2a²(3a²-5b) (2)(2/3ab²-2ab)1/2ab (3) (-4x²)(3x+1)
(1)2a²(3a²-5b) (2)(2/3ab²-2ab)1/2ab (3) (-4x²)(3x+1)
数学人气:531 ℃时间:2020-01-25 07:32:03
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