∫ (5 - 4x)^3 dx
= (1/4)∫ (5 - 4x)^3 d(4x)
= (- 1/4)∫ (5 - 4x)^3 d(- 4x)
= (- 1/4)∫ (5 - 4x)^3 d(5 - 4x)
= (- 1/4) * (5 - 4x)^(3 + 1)/(3 + 1) + C
= (- 1/16)(5 - 4x)^4 + C
逐步凑微分
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