(1)a+c>b=>c>b-a=5=>c>=6a+b+c=2a+5+c为奇数c为偶数则C的最小值为6(2)(a-b)^2+(a-c)^2+(b-c)^2=6=>(a-b,a-c,b-c)=(2,1,1)a>b>c则a-c肯定最大=>a-c=2,a-b=b-c=1=>a=c+2,b=c+1a+b+c=3c+3<=15=>c<=4b+c>a=>2c+1>c+2=>c>=2(c,b,a)=(2,3,4),(3,4,5),(4,5,6)