求(x^3-6x+5)/(x-1)最小值 - 知识问答

求(x^3-6x+5)/(x-1)最小值

1个回答

(x³-6x+5)/(x-1)
=[x³-x-(5x-5)]/(x-1)
=[x(x²-1)-5(x-1)]/(x-1)
=x(x+1)-5
=x²+x-5
=(x+1/2)²-21/4
最小值-21/4
打字不易,

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