Mine

\begin{pmatrix}a_{1,1}+(b_{1,1}+c_{1,1}) & a_{1,2}+(b_{1,2}+c_{1,2}) & \dots & a_{1,n-1}+(b_{1,n-1}+c_{1,n-1}) & a_{1,n}+(b_{1,n}+c_{1,n})\\a_{2,1}+(b_{2,1}+c_{2,1}) & a_{2,2}+(b_{2,2}+c_{2,2}) & \dots & a_{2,n-1}+(b_{2,n-1}+c_{2,n-1}) & a_{2,n}+(b_{2,n}+c_{21,n})\\\dots & \dots & \dots & \dots & \dots\\a_{n-1,1}+(b_{n-1,1}+c_{n-1,1}) & a_{n-1,2}+(b_{n-1,2}+c_{n-1,2}) & \dots & a_{n-1,n-1}+(b_{n-1,n-1}+c_{n-1,n-1}) & a_{n-1,n}+(b_{n-1,n}+c_{n-1,n})\\a_{n,1}+(b_{n,1}+c_{n,1}) & a_{n,2}+(b_{n,2}+c_{n,2}) & \dots & a_{n,n-1}+(b_{n,n-1}+c_{n,n-1}) & a_{n,n}+(b_{n,n}+c_{n,n})\\\end{pmatrix}