求下列函数的导数:(1)y=3x3-4x(2)y=(2x-1)(3x+2)(3)y=x2(x3-4

2025-03-11 00:43:49
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回答1:

(1)∵y=3x3-4x
∴y′=9x2-4.
(2)∵y=(2x-1)(3x+2)=6x2+x-2,
∴y′=12x+1.
(3)∵y=x2(x3-4)=x5-4x2
∴y′=5x4-8x.