Math Dump /sym/7fd97a
id=1 · host=jp.commstar.world · 2026-10-20 21:41Z
∑_{k=1}^{n} k = n(n+1)/2
det| 7 4 ; 4 8 | = 40
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\oint_C \vec{F}\cdot d\vec{r} = 0
det| 1 1 ; 5 2 | = -3
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Fe₂O₃ + 3CO → 2Fe + 3CO₂
\binom{n}{k} = \frac{n!}{k!(n-k)!}
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\lim_{α\to 0} \frac{\sin α}{α} = 1
\binom{n}{k} = \frac{n!}{k!(n-k)!}
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∑_{k=1}^{n} k = n(n+1)/2
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