(4).设函数y=(2x-3)/(x^2-3x+2),求 y^(
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y=(2x一3)/(x^2一3x+2),
y'=【2(x^2一3x+2)一(2x一3)(2x一3)】/(x^2一3x+2)^2
=(2x^2一6x+4一4x^2+12x一9)/(x^2一3x+2)^2
=(一2x^2+6x一5)/(x^2一3x+2)^2。
y'=【2(x^2一3x+2)一(2x一3)(2x一3)】/(x^2一3x+2)^2
=(2x^2一6x+4一4x^2+12x一9)/(x^2一3x+2)^2
=(一2x^2+6x一5)/(x^2一3x+2)^2。
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y = (2x-3)/(x^2-3x+2) = 1/(x-1) + 1/(x-2)
y' = -1/(x-1)^2 - 1/(x-2)^2
y'' = (-1)(-2)/(x-1)^3 +(-1)(=2)/(x-2)^3
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y^(n) = (-1)^n n!/(x-1)^(n+1) + (-1)^n n!/(x-2)^(n+1)
y' = -1/(x-1)^2 - 1/(x-2)^2
y'' = (-1)(-2)/(x-1)^3 +(-1)(=2)/(x-2)^3
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y^(n) = (-1)^n n!/(x-1)^(n+1) + (-1)^n n!/(x-2)^(n+1)
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