线性方程组求解，输入是N（N<256）元线性方程组Ax=B，输出是方程组的解，也可能无解或有多组解。可以用高斯消去法求解，也可以采用其它方法-Linear equations, the input is N (N < 256) linear equations Ax = B, and the output is the solution of equations, may also be no solution or mult