一个MATLAB 的程序学习

$$
A=
\left\{
\begin{array}{cccc|c}
a & b & c & d & e\\
f & g & h & i & j \\
k & l & m & n & o \\
p & q & r & s & t
\end{array}
\right\}
$$

$$f(n)=n^n \quad \text{n$\in N^\ast$}$$

$$a = \left(1 + 2 + 3 + \cdots\right. \\ \left. n - 2 + n - 1 + n\right.)$$

$$
\frac {\frac{x^2}{2y+z}}{x^3+5x-2y}
$$

应用举例：
$$\sum_{1<=i<=N}{\frac {N-i+1}{i^{N-1}} }$$

$$\sum_{i=1}^{N}{\frac {N-i+1}{i^{N-1}} }$$

$$
\begin{Vmatrix} 1 & 2 & 3 \\ 2 & 3 & 4 \\ 4 & 5 & 6 \\ \end{Vmatrix}
$$

$$
\begin{bmatrix}
a_{1,1} & a_{1,2} & a_{1,3} & \cdots & a_{1,n} \\
a_{2,1} & a_{2,2} & a_{2,3} & \cdots & a_{2,n} \\
\vdots & \vdots & \vdots & \ddots & \vdots \\
a_{m,1} & a_{m,2} & a_{m,3} & \cdots & a_{m,n} \\
\end{bmatrix}
$$

$$
\left \{
\begin{array}{c}
a_1x+b_1y+c_1z=d_1 \\
a_2x+b_2y+c_2z=d_2 \\
a_3x+b_3y+c_3z=d_3
\end{array}
\right.
$$

$$x+y=1  \tag{1} $$
$$x-y=-1  \tag{2}$$
$$联立得，x=2,y=-1$$

$$
\begin{aligned}
&max=2*x1+3*x2;\\
&x1+2*x2<=8;\\
&4*x1<=16;\\
\text{subject to}\quad&s4*x2<=12;
\end{aligned}
$$