Symbolic Index /sym/ea4bfa
id=1 · host=au.commstar.world · 2026-10-20 14:53Z
∑_{k=1}^{n} k = n(n+1)/2
∑_{k=1}^{n} k = n(n+1)/2
244K
Fe₂O₃ + 3CO → 2Fe + 3CO₂
52K
det| 12 5 ; 4 13 | = 136
H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O
det| 9 4 ; 1 10 | = 86
50K
det| 1 2 ; 7 2 | = -12
137K
∑_{k=1}^{n} k = n(n+1)/2
197K
CH₄ + 2O₂ → CO₂ + 2H₂O
262K