To the inverse problem of the system of linear algebraic equations, tiauthor gives a symmetric matrix solution and the expression of its general solution.
本文给出线性代数方程组反问题的对称矩阵解，及其通解表达式。
Relied on previous data, the general expression of displacement fundamental solution for three-dimension bi-materials under coordinate system oblique to interface is given.
利用已有的三维双相材料位移基本解，给出了在与界面斜交坐标系下位移基本解的一般表达式。
Least-squares problem of the real matrices is discussed and the expression of general solution is given.
首先讨论子阵约束下实矩阵反问题的最小二乘问题，给出了解的一般表达式。
应用推荐