对于x^n的积分,
显然有公式
∫ x^n dx=1/(n+1) *x^(n+1) ,n不等于 -1
所以
∫(1->3) x^3 dx
= 1/4 *x^4 代入上下限3和1
=1/4 *(3^4 -1)
=80/4
=20
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