11. (3 points) The sum of all numbers in the following square matrix is $\qquad$
$$
\begin{array}{l}
1,2,3, \ldots ., 98,99,100 \\
2,3,4, \ldots, 99,100,101 \\
3,4,5, \ldots, 100,101,102 \\
\ldots \\
100,101,102, \ldots, 197,198,199
\end{array}
$$

【Solution】The first term is:
$$
\begin{aligned}
& (1+100) \times 100 \div 2 \\
= & 101 \times 50 \\
= & 5050
\end{aligned}
$$

The last term is:
$$
5050+99 \times 100=14950
$$

The sum of all numbers is:
$$
\begin{aligned}
& (5050+14950) \times 100 \div 2 \\
= & 20000 \times 50 \\
= & 1000000
\end{aligned}
$$

Therefore, the answer is: 1000000.
11. (3 points) The sum of all numbers in the matrix below is $\qquad$
$$
\begin{array}{l}
1,2,3, \ldots, 98,99,100 \\
2,3,4, \ldots, 99,100,101 \\
3,4,5, \ldots, 100,101,102 \\
\ldots \\
100,101,102, \ldots, 197,198,199
\end{array}
$$