请问大一高数高阶求导的这道题怎么做,谢谢
2个回答
2017-10-21
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x^2-3x+2 = (x-1)(x-2)
let
x/(x^2-3x+2) ≡ A/(x-1) +B/(x-2)
x ≡ A(x-2) +B(x-1)
x=1, => A = -1
x=2, => B = 2
x/(x^2-3x+2) ≡ -1/(x-1) +2/(x-2)
y=x/(x^2-3x+2)
=-1/(x-1) +2/(x-2)
y^(n) = (-1)^n . (n-1)!/(x-1)^(n+1) + 2(-1)^(n-1) . (n-1)!/(x-2)^(n+1)
let
x/(x^2-3x+2) ≡ A/(x-1) +B/(x-2)
x ≡ A(x-2) +B(x-1)
x=1, => A = -1
x=2, => B = 2
x/(x^2-3x+2) ≡ -1/(x-1) +2/(x-2)
y=x/(x^2-3x+2)
=-1/(x-1) +2/(x-2)
y^(n) = (-1)^n . (n-1)!/(x-1)^(n+1) + 2(-1)^(n-1) . (n-1)!/(x-2)^(n+1)
追问
这是啥
不是这道题吧
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