计算方法数值方程，用列主元Gauss消去法解释线性方程组Ax=b，其中A=[10E-8 2 3,-1 3.712 4.623,-2 1.072 5.643],b=[1,2,3]-Calculated value equation, the main-element Gauss elimination explanation of linear equations Ax = b, where A = [10E-8 2 3,-1 3.712 4.623,-2 1.072 5.643], b = [1,2,3 ]