→ pentiumevo :thx 04/20 15:56
※ 引述《pentiumevo (pentiumevo)》之銘言：
: (x^2)*exp(x)
: ∫------------dx
: (x+2)^2
: 提示給分部積分法,但我沒找到...
: 麻煩大家了,謝謝
u=x+2, exp(x)=exp(u-2), dx=du
x^2=(u-2)^2=u^2-4u+4
x^2/(x+2)^2= u - 4/u + 4/u^2
(d/du) (e^u / u)= e^u / u - e^u / u^2
You can finish it.
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 112.104.142.119