因为a>b>c,a,b,c都是正整数所以c的最小值是1(1)当c=1时 1/a+1/b+1/c>1(2)当c=2,b=3,a=4时,1/a+1/b+1/c=13/12>1当c=2,b=3,a=5时,1/a+1/b+1/c=31/30>1当c=2,b=3,a=6时,1/a+1/b+1/c=1,但2=3