| (x-a)(y-a)+(y-a)(z-a)+(z-a)(x-a) |
| (x-a)2+(y-a)2+(z-a)2 |
| 2a |
| 2a2+a+2 |
| x |
| 3 |
| 2a2 |
| 2a4+a2+2 |
| x |
| y+z |
| y |
| z+x |
| z |
| x+y |
| a |
| a+1 |
| b |
| b+1 |
| c |
| c+1 |
| 3 |
| x4-6x3-2x2+18x+23 |
| x2-8x+15 |
| x+2 |
| x2-2x |
| x-1 |
| x2-4x+4 |
| x2-16 |
| x2+4x |
| 1 |
| (x-2)2 |
| 1 |
| (x-2)2 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| a |
| 1 |
| 1+a2 |
| 1 |
| a |
| 1 |
| 1+a2 |
| 1 |
| a |
| 1 |
| 2 |
| 1 |
| 6 |
| 1 |
| 2 |
| 1 |
| c |
| 1 |
| 9 |
| 1 |
| a |
| 1 |
| c |
| 1 |
| 15 |
| a2c |
| a2+2c+ac |
| 七5 |
| 31 |
| 七5 |
| 31 |
| 1 |
| x |
| 1 |
| x2 |
| 1 |
| a |
| 1 |
| b |
| 2a-3ab+2b |
| -a+2ab-b |
| 7 |
| 3 |
| 7 |
| 3 |