a, b, c, a+b+c
1, 2, 3, 6,
10, 11, 12, 33,
99, 100, 101 300
(x-1)+x+(x+1)=99;即3x=99;x=33,∴这三个数是32,33,34.
5x=55;x=11;∴这五个数是9,10,11,12,13.