2. (a+b)(a-b)=a^2-b^2
3. (x+a)(x+b)=x^2+(a+b)x+ab
4. (ax+b)(cx+d)=acx^2+(ad+dc)x+bd
5. (a±b)^3=a^3±3a^2b+3ab^2±b^3 (複号同順)
6. (a±b)(a^2干ab+b^2)=a^3±b^3 (複号同順)
7. (a+b+c)^2=a^2+b^2+c^2+2ab+2bc+2ca
註:^はべき乗です
| S | M | T | W | T | F | S |
| 1 | 2 | 3 | ||||
| 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| 11 | 12 | 13 | 14 | 15 | 16 | 17 |
| 18 | 19 | 20 | 21 | 22 | 23 | 24 |
| 25 | 26 | 27 | 28 | 29 | 30 | 31 |









