好吧问答库 > 高数，求解。

高数，求解。

2025年04月06日 03:09
有3个网友回答
网友（1）：


如图

网友（2）：

令u=x^2, du=2xdx, x^3=x*(x^2), 积分变成u/(2(u+9))对u的积分。
等于1/2-9/(2(9+u))对u的积分，等于u/2-（9/2)ln|u+9|+C, 回到x，等于x^2/2-(9/2)ln(x^2+9)+C

网友（3）：

有理式展开

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