Symbolic Index /sym/ea4bfa
id=1 · host=au.commstar.world · 2026-10-20 14:38Z
∑_{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
∑_{k=1}^{n} k = n(n+1)/2
91K
H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O
H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O
100K
det| 4 9 ; 7 5 | = -43
\frac{12}{7} \sum_{i=1}^{n} i^{2}
137K
det| 1 1 ; 3 2 | = -1
det| 1 2 ; 7 2 | = -12
196K
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