u' = -3t²/2 + 3t

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u' = -3t²/2 + 3t
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u' = -3t²/2 + 3t
u' = -3t²/2 + 3t

u' = -3t²/2 + 3t
根据y=x^n
则y'=nx^(n-1)
u= -t³/2 + 3t²/2
u' = -3t²/2 + 3t