Solution: Let the first number be a and the second number be a+1; The third number is +2.

According to the meaning: A 2+(A+2) 2 =100.

Agenda solution: 2a 2+4a+4 =100.

a^2 + 2a + 2 = 50。

a^2 + 2a - 48 = 0。

A =[-2+ radical sign (4+ 192)]/2

=- 1+ root sign (49)

= - 1 + 7

= 6.

A: These three serial numbers are: 6, 7 and 8.