latex中常用的几个\begin
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一、\begin{align*}
align带上*号，表示省略公式后面编号。
\begin{align*}
& {{x}_{k}}=f({{x}_{k-1}},{{v}_{k-1}}) \\
& {{z}_{k}}=h({{x}_{k}},{{n}_{k}})
\end{align*}显示为\begin{align*} & {{x}_{k}}=f({{x}_{k-1}},{{v}_{k-1}}) \\ & {{z}_{k}}=h({{x}_{k}},{{n}_{k}}) \end{align*}
\begin{alig}
& {{x}_{k}}=f({{x}_{k-1}},{{v}_{k-1}}) \\
& {{z}_{k}}=h({{x}_{k}},{{n}_{k}})
\end{align}\begin{align}
& {{x}_{k}}=f({{x}_{k-1}},{{v}_{k-1}}) \\
& {{z}_{k}}=h({{x}_{k}},{{n}_{k}})
\end{align}
\begin{equation}
\begin{aligned}
x^2 + y^2 &= 1 \\
x &= \sqrt{1-y^2} \\
\text{and also }
y &= \sqrt{1-x^2} \\
z &=\sqrt{x^2+y^2}
\end{aligned}
\end{equation}\begin{equation}
\begin{aligned}
x^2 + y^2 &= 1 \\
x &= \sqrt{1-y^2} \\
\text{and also }
y &= \sqrt{1-x^2} \\
z &=\sqrt{x^2+y^2}
\end{aligned}
\end{equation}
二、\begin{gather*}
每个公式各自居中对齐
\begin{gather*}
{{l}_{0}}(x)=\frac{(x-{{x}_{1}})(x-{{x}_{2}})}{({{x}_{0}}-{{x}_{1}})({{x}_{0}}-{{x}_{2}})}=\frac{x(x-2)}{3};\\
{{l}_{1}}(x)=\frac{(x-{{x}_{0}})(x-{{x}_{2}})}{({{x}_{1}}-{{x}_{0}})({{x}_{1}}-{{x}_{2}})}=-\frac{(x+1)(x-2)}{2};\\
{{l}_{2}}(x)=\frac{(x-{{x}_{0}})(x-{{x}_{1}})}{({{x}_{2}}-{{x}_{0}})({{x}_{2}}-{{x}_{1}})}=\frac{x(x+1)}{6}
\end{gather*}\begin{gather*}
{{l}_{0}}(x)=\frac{(x-{{x}_{1}})(x-{{x}_{2}})}{({{x}_{0}}-{{x}_{1}})({{x}_{0}}-{{x}_{2}})}=\frac{x(x-2)}{3};\\
{{l}_{1}}(x)=\frac{(x-{{x}_{0}})(x-{{x}_{2}})}{({{x}_{1}}-{{x}_{0}})({{x}_{1}}-{{x}_{2}})}=-\frac{(x+1)(x-2)}{2};\\
{{l}_{2}}(x)=\frac{(x-{{x}_{0}})(x-{{x}_{1}})}{({{x}_{2}}-{{x}_{0}})({{x}_{2}}-{{x}_{1}})}=\frac{x(x+1)}{6}
\end{gather*}