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• $i=\frac{x^2}{3x^5}\mathrm{}$

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• $i=\frac{x^2}{3x^5}\mathrm{}$ inline

ddd ${\displaystyle \frac{x^2}{4}\mathrm{}}$

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สวัสดีครับนี่คือการทดสอบ

1. $\frac{-b\pm \sqrt{b^2-4ac}}{2a}\mathrm{}$
2. $\frac{x}{3^x}\mathrm{}$

${\displaystyle \frac{-b\pm \sqrt{b^2-4ac}}{2a}\mathrm{}}$

${\displaystyle \left\{\begin{array}{ccc}{S}_{11}& ...& S_{1n}\\ ⋮& \ddots & ⋮\\ S_{m1}& ...& S_{mn}\end{array}\right]}$

$x^2$ or $a_{mn}$ or $a_{mn}$ or $\frac{x\mathrm{+1}}{y}\mathrm{}$ or $\sqrt{x}$

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