| a(a−b)+b(a−b)−a2 |
| a(a−b) |
| a(a+b)−b(a+b)−a2 |
| a(a+b) |
=
| −b2 |
| a(a−b) |
| a(a+b) |
| −b2 |
=
| a+b |
| a−b |
由3a-2b=0知，3a=2b，
则原式=
| a+b |
| a−b |
| 2a+2b |
| 2a−2b |
| 2a+3a |
| 2a−3a |
| b |
| a |
| a |
| a−b |
| b |
| a |
| a |
| a+b |
| a(a−b)+b(a−b)−a2 |
| a(a−b) |
| a(a+b)−b(a+b)−a2 |
| a(a+b) |
| −b2 |
| a(a−b) |
| a(a+b) |
| −b2 |
| a+b |
| a−b |
| a+b |
| a−b |
| 2a+2b |
| 2a−2b |
| 2a+3a |
| 2a−3a |