Symbolic Index /sym/ea4bfa
id=1 · host=au.commstar.world · 2026-10-20 14:40Z
∑_{k=1}^{n} k = n(n+1)/2
det| 12 9 ; 5 13 | = 111
244K
det| 12 5 ; 4 13 | = 136
det| 8 5 ; 3 9 | = 57
90K
H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O
det| 4 6 ; 4 5 | = -4
100K
det| 3 6 ; 0 4 | = 12
137K
∑_{k=1}^{n} k = n(n+1)/2
197K
det| 2 7 ; 7 3 | = -43
262K
∑_{k=1}^{n} k = n(n+1)/2
196K