| 1 |
| x+2 |
| 1 |
| x+1 |
| x+1 |
| (x+2)(x+1) |
| x+2 |
| (x+1)(x+2) |
| x+1-(x+2) |
| (x+1)(x+2) |
| 1 |
| (x+1)(x+2) |
| 1 |
| 3 |
| 3 |
| a+1 |
| a-1 |
| a2+a |
| a2-1 |
| 3 |
| a-3 |
| a |
| 3-a |
| x2 |
| y-x |
| y2 |
| y-x |
| A．-x-y | B．x-y | C．x+y | D．y-x |
| 4a2 |
| 2a-b |
| b2 |
| b-2a |
| A．-2a-b | B．b-2a | C．2a-b | D．2a+b |
| 1 |
| 1×2 |
| 1 |
| 1 |
| 1 |
| 2 |
| 1 |
| 2×3 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3×4 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| n(n+1) |
| 1 |
| (x+1)(x+2) |
| 1 |
| (x+2)(x+3) |
| 1 |
| (x+3)(x+4) |
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