Symbolic Index /sym/ea4bfa
id=1 · host=au.commstar.world · 2026-10-20 14:55Z
∑_{k=1}^{n} k = n(n+1)/2
∑_{k=1}^{n} k = n(n+1)/2
244K
det| 12 5 ; 4 13 | = 136
\binom{n}{k} = \frac{n!}{k!(n-k)!}
91K
H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O
det| 9 4 ; 1 10 | = 86
50K
det| 4 9 ; 7 5 | = -43
\frac{11}{6} \sum_{i=1}^{n} i^{2}
137K
det| 1 1 ; 3 2 | = -1
\binom{n}{k} = \frac{n!}{k!(n-k)!}
262K
det| 12 9 ; 3 13 | = 129
\frac{12}{7} \sum_{i=1}^{n} i^{2}
218K
\oint_C \vec{F}\cdot d\vec{r} = 0
299K
F = ma
CaCO₃ → CaO + CO₂