※ 引述《Itoldyou ()》之铭言：
: http://ppt.cc/J7Ua
: 不好意思各位大大
: 想请教帮忙解决这个题目
: 脑袋卡了几天 快成糨糊了
: 感激不尽
9 - x^3 = t^3 x^3 => x^3 = 9 / (t^3 + 1 )
=> x = A /(t^3 + 1)^(1/3) ( A= 9^(1/3) )
dx = (-1/3) A (t^3+1)^(-4/3) * 3t^2 = -A t^2 * (t^3 + 1)^(-4/3)
t^3 + 1 (t^3+1)^(1/3) - A * t^2
=>∫