| (a-b)(b-c)(c-a) |
| (b-a)(a-c)2(c-b)3 |
| 3a3b |
| -45a2b3 |
| a4-16 |
| 2a2b+8b |
| a2-4ab+4b2 |
| a4-8a2b2+16b4 |
| x2+6x+9 |
| x2-9 |
| m2-3m+2 |
| m2-m |
| ma+mb+mc |
| a+b+c |
| a2-4ab+4b2 |
| a2-4b2 |
| 6a+18 |
| a2-9 |
| xn(y2n-1) |
| xn+1(yn+1) |
| ab |
| a2b2c |
| a2-4 |
| a2+4a+4 |
| 4ab |
| 他2a五b |
| x2-y2 |
| x2+2xy+y2 |
| -35a4b3c |
| 21a2b4d |
| x2-(y-z)2 |
| (x+y)2-z2 |