设函数f(u)一阶可导,且z(x,y)=∫0ye-yf(x+t)dt,则=________.

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问题 设函数f(u)一阶可导,且z(x,y)=∫0ye-yf(x+t)dt,则=________.

选项

答案-e-yf(x+y)+e-yf’(x+y)+e-yf(x)

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