| b |
| (a-b)3 |
| b |
| (b-a)3 |
| b |
| (a-b)3 |
| b |
| (a-b)3 |
| a-b |
| (a-b)3 |
| 1 |
| (a-b)2 |
| 4x2-y2 |
| x2-4y2 |
| (2x-y)2 |
| x2-4y2 |
| 2y2-4xy |
| 4y2-x2 |
| 4 |
| x2-1 |
| x+1 |
| x-1 |
| 2x2+1 |
| x2-5x+6 |
| x2-1 |
| x2-5x+6 |
| 4-5x |
| x2-5x+6 |
| x+y |
| x-y+z |
| x+z |
| y-x-z |
| y+z |
| z+x-y |
| x-1 |
| x+1 |
| N |
| x+1 |
| A．-1 | B．1 | C．-2 | D．2 |
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