`$ $` `$ c = \pm\sqrt{a^2 + b^2} $` ```[math] ``` ## ```[math] \delta^2 ``` ## 基本 1. `$ \pi $` 2. `$ \frac a b $` 3. `$ x_1 $` 4. `$ e^x $` 5. `$ \sqrt{y} $` 6. `$ \le $` 7. `$ \ge $` 8. `$ \gt $` 9. `$ \exists $` 存在 10. `$ \in $` 11. `$ \empty $` 12. `$ \int $` 13. `$ \iint $` 14. `$ \bigcap $` 15. `$ \bigcup $` 16. `$ \cup $` 17. `$ x \pod a $` 18. `$ \pm $` 19. `$ \sqrt[3]{x} $` 20. `$ \psi $` 21. `$ \dots $` 22. `$ \bar{y} $` 23. `$ \beta $` 24. `$ \cong $` 25. `$ \delta $` 26. `$ \Delta $` 27. `$ \div $` 28. `$ \eta $` 29. `$ \infin $` 30. `$ \int $` 31. `$ \intercal $` 32. `$ \lambda $` 33. `$ \ne $` 34. `$ \mu $` 35. `$ \Omega $` 36. `$ \Phi $` 37. `$ \sigma $` 38. `$ \tau $` 39. `$ \varepsilon $` 40. `$ \hat{\theta} $` 41. `$ \chi $` 42. `$ \rightarrow $` 43. `$ \cdot $` 44. `$ \sim $` 45. `$ \sqrt[n]{1+x} $` 46. `$ \xi $` 47. `$ \rho $` 48. `$ \Delta $` 49. `$ $` ```[math] \sum_{\mathclap{1\le i\le j\le n}} x_{ij} ``` ```[math] \sum_{0<i<10} ``` ```[math] \sum_{i=1}^n ``` ```[math] {n \choose k} ``` ## 极限 ```[math] \lim_x ``` ## 三角函数 `$ \arcsin $` ## 方程 ```[math] \begin{cases} x^2+y^2=1 \\ 2x^2+4y^2 = 10 \end{cases} ``` ## 矩阵行列式 ` ` ```[math] \begin{pmatrix} a & b \\ c & d \end{pmatrix} ``` ```[math] \begin{vmatrix} a & b \\ c & d \end{vmatrix} ```