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this is the mathjax

inline : calculate this $ \ \sum^n_i(a_i+b)\times (\frac{1}{x_i}) = y^c$

block :

this is the code

see this :

#include <cstdio>
int main(int argc, char **argv)                                                       
{
    printf("Hello, World!\n");
    return 0;
}

this is the picture

holidays.