F(a,b,c)=什么?
=1/2(a+b+c-|a-b-c|)
=1/3(a+b+c-|a-b-c|)
=1/2(a+b+c-|a-b+c|)
=1/3(a+b+c-|a-b+c|) 不是F(a,b,c)是求F（（a,b）,c）的最大值F（（a,b）,c）=F（F（a,b）,c）?對(duì)F(a,b)=1/2(a+b-|a-b|)a>=b時(shí)， F(a,b)=1/2(a+b-a+b)=ba4時(shí)，f(x)>g(x)當(dāng)-1<=x<=4時(shí)，f(x)<=g(x)比較f(x)和h(x)f(x)-h(x)=x^2+x-6=(x+3)(x-2)當(dāng)x<-3或x>2時(shí)，f(x)>h(x)當(dāng)-3<=x<=2時(shí)，f(x)<=h(x)比較g(x)和h(x)g(x)-h(x)=4x-2x>1/2時(shí)，g(x)>h(x)x<=1/2時(shí), g(x)<=h(x)綜上，F(xiàn)((f(x),g(x)),h(x))=當(dāng)x<=-3或x>=4時(shí)， x^2當(dāng)-3