使用者:ERS ROHU/數學區

這只是一個數學實驗區~

神·公式 (∑的秘方)

鬼知道它是被如何發現的……

公式
$\sum _{k=1}^{n}k=n(n+1)\div 2$ 或者這麼寫： $\sum _{k=1}^{n}k={\frac {n(n+1)}{2}}$ 是的，它看上去是很簡單 但它並沒有這麼簡單⋯⋯

另外一個

沒想到吧！

公式
$\sum _{k=b(b\neq \leqslant 1)}^{n}k=n(n+1)\div 2-b$

分數的秘密

我們都知道，什麼是分數。 但下面有東西啊

好的首先我們需要知道帶分數、假分數之間如何轉換，請看下面的公式： $a{\frac {b}{c}}={\frac {(ac+b)c}{c}}$

平方根

有限分數 （轉化為小數後是有限小數的分數）

公式
${\sqrt {\frac {a}{b}}}={\frac {\sqrt {ab}}{b}}$

例子
${\sqrt {\frac {5}{19}}}={\frac {\sqrt {19\times 5}}{19}}={\frac {\sqrt {95}}{19}}$

古戈爾普勒克斯

有本事你就展開

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這就是古戈爾普勒克斯（$10^{10^{100}}$）