求下列函数的单调区间和极值①f(x)=2x^3-6x^2-18x+5 ②f(x)...

2022-11-07 10:08发布

①f(x)=2x^3-6x^2-18x+5f(x)=6x^2-12x-18f(x)=12x-12令f(x)=6x^2-12x-18=0得x=-1或x=3f(-1

①f(x)=2x^3-6x^2-18x+5f(x)=6x^2-12x-18f(x)=12x-12令f(x)=6x^2-12x-18=0得x=-1或x=3f(-1