Question

看图求解答.求函数最小值

Answer 1

f(x)=1/6-(22-x)/(12*(x-5)^2)

12*f(x)=2+[(x-5)-17]/(x-5)^2

12*f(x)=2+1/(x-5)-17/(x-5)^2=-17[1/(x-5)-1/34]^2+17/34^2+2

因为,x>=9,所以,x-5>=4,0