y=2x^3-6x^2-18X+a 数值与单调区间
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y=2x^3-6x^2-18X+a 数值与单调区间
y=2x^3-6x^2-18X+a 数值与单调区间
y=2x^3-6x^2-18X+a 数值与单调区间
y'=6x^2-12x-18=6(x+1)(x-3)
y'>0单调递增 x〉3或x〈-1
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