百度有，挺容易听懂的
by exdtables @ 2022-01-16 09:35:21
$$V=\int_0^h\pi(\frac {Rx}h)^2dx=\frac{\pi R^2}{h^2}\int_0^hx^2dx=\frac 13\pi R^2h$$
by Guoyh @ 2022-01-16 09:37:12
@[_Guoyh_](/user/88449) ~~积分大草~~ %%%
by FLAMEs_ @ 2022-01-16 09:38:17
@[_Guoyh_](/user/88449)
这个确实简单，~~毕竟步骤少~~
by exdtables @ 2022-01-16 09:38:38
没问题，初中生是能看得懂积分（雾
by Raymondzll @ 2022-01-16 09:46:23
@[Raymondzll](/user/225192) 积分什么的不是小学奥数的吗？
by O3O_O3O_O3O @ 2022-01-16 09:47:10
@[O3O_O3O_O3O](/user/513807) 小奥居然恐怖到了这个地步吗
by Eason_AC @ 2022-01-16 09:49:00
@[Eason_AC](/user/112917) 其实（好像）是个梗……
by O3O_O3O_O3O @ 2022-01-16 09:49:40
但是$AMC8$好像考的就是~~这样的~~小学奥数题。
by O3O_O3O_O3O @ 2022-01-16 09:51:16
警惕新型校园霸凌：使用积分和求导解决初中数学问题
by Raymondzll @ 2022-01-16 09:51:41