1. As shown in the figure, there are 30 cells, each containing a number. The numbers in the top row and the leftmost column are already filled in. Each of the remaining cells contains a number that is the sum of the number in the leftmost cell of the same row and the number in the top cell of the same column (for example, $a=14+17=31$). What is the total sum of these 30 numbers?
1.745
1.【Solution】From the rules of filling in numbers in the problem, we know that in the six cells in the same row as 12, there is the addend 12, so the total sum has six 12s added together. In the six cells in the same row as 14, there is the addend 14, so the total sum has six 14s added together. Similarly, in the rows with 16 and 18, there are six 16s and six 18s, respectively. That is, from the row perspective, the total sum has six 12s, six 14s, six 16s, and six 18s, and their sum is $6 \times(12 + 14 + 16 + 18)$.

From the column perspective, in the five cells in the same column as 11, there is the addend 11, so the total sum has five 11s. Similarly, the total sum has five 13s, five 15s, five 17s, and five 19s, and their sum is: $5 \times(11 + 13 + 15 + 17 + 19)$.

In the grid, there is also the number 10, and there are no other numbers, so the total sum
$$
=6 \times(12 + 14 + 16 + 18) + 5 \times(11 + 13 + 15 + 17 + 19) + 10 = 745 \text{. }
$$