R代码¹

summary(cars)

##      speed           dist       
##  Min.   : 4.0   Min.   :  2.00  
##  1st Qu.:12.0   1st Qu.: 26.00  
##  Median :15.0   Median : 36.00  
##  Mean   :15.4   Mean   : 42.98  
##  3rd Qu.:19.0   3rd Qu.: 56.00  
##  Max.   :25.0   Max.   :120.00

公式²

同行公式：\(y=x^{2}\),后边一定要有内容³

独行公式：⁴ \[y=x^{3}\] 复杂公式：⁵

\[\sum_{i=0}^{N} \int_{a}^{b} g(t, i) \mathrm{d} t\] \[\begin{bmatrix} {a_{11}}&{a_{12}}&{\cdots}&{a_{1n}}\\ {a_{21}}&{a_{22}}&{\cdots}&{a_{2n}}\\ {\vdots}&{\vdots}&{\ddots}&{\vdots}\\ {a_{m1}}&{a_{m2}}&{\cdots}&{a_{mn}}\\ \end{bmatrix}\]

\[\begin{array}{cc} a & b \\ c \end{array}\]

插入图片