Symbolic Index /sym/ea4bfa
id=1 · host=au.commstar.world · 2026-10-20 14:54Z
∑_{k=1}^{n} k = n(n+1)/2
∑_{k=1}^{n} k = n(n+1)/2
244K
det| 12 9 ; 5 13 | = 111
52K
det| 12 5 ; 4 13 | = 136
det| 11 9 ; 5 12 | = 87
90K
det| 11 2 ; 5 12 | = 122
91K
H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O
det| 4 9 ; 7 5 | = -43
∑_{k=1}^{n} k = n(n+1)/2
137K
det| 7 4 ; 4 8 | = 40
197K