1. (8 points) The calculation result of the expression $1 \times 2+3 \times 4+5 \times 6+7 \times 8+9 \times 10$ is
1. (8 points) The calculation result of the expression $1 \times 2+3 \times 4+5 \times 6+7 \times 8+9 \times 10$ is $\qquad$
【Answer】Solution: $1 \times 2+3 \times 4+5 \times 6+7 \times 8+9 \times 10$
$$
\begin{array}{l}
=2+12+30+56+90 \\
=190
\end{array}
$$

Therefore, the answer is: 190.