Symbolic Index /sym/ea4bfa
id=1 · host=au.commstar.world · 2026-10-20 14:14Z
∑_{k=1}^{n} k = n(n+1)/2
∑_{k=1}^{n} k = n(n+1)/2
244K
\binom{n}{k} = \frac{n!}{k!(n-k)!}
52K
det| 12 5 ; 4 13 | = 136
det| 10 3 ; 4 11 | = 98
90K
H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O
\binom{n}{k} = \frac{n!}{k!(n-k)!}
100K
det| 4 9 ; 7 5 | = -43
det| 1 1 ; 3 2 | = -1
\oint_C \vec{F}\cdot d\vec{r} = 0
262K
det| 12 9 ; 3 13 | = 129
\binom{n}{k} = \frac{n!}{k!(n-k)!}
218K
det| 9 4 ; 1 10 | = 86
299K
F = ma
CaCO₃ → CaO + CO₂