y=2x∧3-6x∧2-18x+7极值

问题描述:

y=2x∧3-6x∧2-18x+7极值

y=2x∧3-6x∧2-18x+7
y'=6x^2-12x-18=0
x^2-2x-3=0
(x-3)(x+1)=0
得x=-1,x=3
最大值y=(-1)=17,
最小值 y=(3)=-47那y=3-(x+1)(1/3)×2 呢?极值,那y=3-(x+1)(1/3)×2 呢?极值y=3-2/3(x+1)y=3-2/3(x+2/3y=11/3-2/3xy'=-2/3如果是换成(x+1)∧1/3呢!y=3-2(x+1)^1/3y'=-2/3*(x+1)^(-2/3)