设y=xex,求yn. 我需要详细过程,谢谢
y=xe^x,那么y′=e^x+xe^x,y′′=e^x+e^x+xe^x=2e^x+xe^x=e^x(2+x)以此类推,y的n阶导数=e^x(n+x)
设y=xex,求y(n).
【答案】:y'=ex+xex=(x+1)ex,y"=ex+(x+1)ex=(x+2)ex,y"'=ex+(x+2)ex=(x+3)ex,y(n)=(x+n)ex.
求哈利波特电影2-7迅雷种子 要中英字幕 每部不要超过1G
thunder:\/\/QUFodHRwOi8vYnQuMnR1LmNjLzAxNERBRjk4NTczRjVFMDAwQ0UwQTY4OTNCMzAxNjY1NDdGQjBCMjEvW9G4wNfPwtTYd3d3LjJ0dS5jY125\/sD7sqjM2DLP+8qntcTD3MrSLkJEMTAyNLjfx+XW0NOiy6vX1i5ybXZiWlo= 《哈利波特3阿兹卡班的囚徒》1.2G thunder:\/\/QUFodHRwOi8vYnQuMnR1LmNjLzQwMTRCQTkwMkFGMjk3...