物理

质心测试梗图

雀食，

为什么要考古？？？

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？？？咋打的

\fbox{\fbox{\fbox{\fbox{\fbox{\fbox{\fbox{\fbox{\fbox{\fbox{哈哈哈}}}}}}}}}}     首尾各一个美元符号

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两边要加$噢

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2.718281828459045…

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$\int_{\sum\limits_{n=0}^{\infty}dfrac 1n}^{\sum\limits_{n=0}^{\infty}dfrac 2n}$

$\int_{\sum\limits_{n=0}^{\infty}\dfrac 1n}^{\sum\limits_{n=0}^{\infty}\dfrac 2n}$

$\int_{\int_0^1}^{\int_1^2}$

$\int_{\int_{\int_0^1}^{\int_1^2}}^{\int_{\int_2^3}^{\int_3^4}}$

$\int_{\int_{int_{\int}^{\int}}^{int_{\int}^{\int}}}^{\int_{int_{\int}}^{\int}^{int_{\int}^{\int}}}$

$\fbox{\fbox{\fbox{哈}哈}哈}$

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${\fbox}{测试}$

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