∴
| b |
| a |
| a |
| b |
| b2 |
| ab |
| a2 |
| ab |
=
| a2+b2 |
| ab |
=
| (a+b)2−2ab |
| ab |
=
| 992−2m |
| m |
∵a、b为质数，∴a=2，b=97，或a=97，b=2，
∴m=2×97=194，
∴
| b |
| a |
| a |
| b |
| 992−2m |
| m |
=
| 992−2×194 |
| 194 |
=
| 9413 |
| 194 |
故选B．
| b |
| a |
| a |
| b |
| 9413 |
| 194 |
| 9413 |
| 99 |
| 9413 |
| 97 |
| b |
| a |
| a |
| b |
| b2 |
| ab |
| a2 |
| ab |
| a2+b2 |
| ab |
| (a+b)2−2ab |
| ab |
| 992−2m |
| m |
| b |
| a |
| a |
| b |
| 992−2m |
| m |
| 992−2×194 |
| 194 |
| 9413 |
| 194 |