2a2+2v2+2c2=2
abc同号时,a2+b2>=2ab,c2+b2>=2cb,a2+c2>=2ac,不等号2边同加 得：2=2a2+2v2+2c2>= 2ab+2bc+2ca
a=b=c=(根号3)/3时,ab+bc+ca=1,所以ab+bc+ca