§ Задание 19
\[\boxed{\mathbf{19.}}\]
\[7 \cdot 2 = 14 < 20\]
\[7 \cdot 3 = 21 > 20\]
\[5 \cdot 7 = 35\]
\[6 \cdot 7 = 42 > 35\]
\[7 \cdot 7 = 49 < 50\]
\[7 \cdot 8 = 56 > 50\]
\[\boxed{\mathbf{19.}}\]
\[7 \cdot 2 = 14 < 20\]
\[7 \cdot 3 = 21 > 20\]
\[5 \cdot 7 = 35\]
\[6 \cdot 7 = 42 > 35\]
\[7 \cdot 7 = 49 < 50\]
\[7 \cdot 8 = 56 > 50\]