| Algebra | |
| logaa=1 | |
| loga1=0 | |
| alogab=b | |
| logba=logca/logcb | |
| logaxy=logax + logay | |
| logax/y=logax - logay | |
| a2 - b2=(a + b)(a - b) | |
| (a + b)2=a2 + 2ab + b2 | |
| (a - b)2=a2 - 2ab + b2 | |
| (a + b)3=a3 + 3a2b + 3ab2 + b3 | |
| (a - b)3=a3 - 3a2b + 3ab2 - b3 | |
| a3 - b3=(a - b)(a2 + ab + b2) | |
| a3 + b3=(a + b)(a2 - ab + b2) | |
| (an) Progresie aritmetica de ratie r si primul termen a1 an=a1 + (n-1) r Sn=[(a1 + an) n]/2 |
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| (an) Progresie geometrica de ratie q si primul termen a1 an=a1 qn-1 Sn=[a1 qn - 1]/ (q - 1) |
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