Условие:
1. Вычисли:
5 * 9 6 * 8 28 : 4 63 : 9
6 * 7 4 * 5 56 : 8 8 : 1
9 * 9 9 * 1 27 : 3 72 : 8
4 * 0 8 * 2 24 : 4 45 : 5
Решение:
\[\boxed{\mathbf{1.}}\]
\[5 \cdot 9 = 45\]
\[6 \cdot 7 = 42\]
\[9 \cdot 9 = 81\]
\[4 \cdot 0 = 0\]
\[6 \cdot 8 = 48\]
\[4 \cdot 5 = 20\]
\[9 \cdot 1 = 9\]
\[8 \cdot 2 = 16\]
\[28\ :4 = 7\]
\[56\ :8 = 7\]
\[27\ :3 = 9\]
\[24\ :4 = 6\]
\[63\ :9 = 7\]
\[8\ :1 = 8\]
\[72\ :8 = 9\]
\[45\ :5 = 9\]