test

Hfaello World!!!

fasdf

\[1+2^2=1\]

\[ fafsdaggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggg \]

fa \[ P = \frac {\sum_{i=1}^n (x_i- x)(y_i- y)} {\displaystyle \left[ \sum_{i=1}^n (x_i-x)^2 \sum_{i=1}^n (y_i-y)^2 \right]^{1/2} } \] ftea

\[ \begin{matrix} {a_{11}}&{a_{12}}&{\cdots}&{a_{1n}}\\ {a_{21}}&{a_{22}}&{\cdots}&{a_{2n}}\\ {\vdots}&{\vdots}&{\ddots}&{\vdots}\\ {a_{m1}}&{a_{m2}}&{\cdots}&{a_{mn}}\\ \end{matrix} \]

\[ \frac{\partial u}{\partial t} = h^2 \left( \frac{\partial^2 u}{\partial x^2} + \frac{\partial^2 u}{\partial y^2} + \frac{\partial^2 u}{\partial z^2}\right) \]

-------------本文结束感谢您的阅读-------------
Donate comment here