\[\boxed{\mathbf{Страница}\mathbf{\ \ 52}\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[\boxed{\mathbf{20}\mathbf{.}\mathbf{\ }}\]
\[8 \cdot 3\] | \[8 \cdot 7\] | \[8 \cdot 9\] | \[8 \cdot 6\] | \[8 \cdot 8\] | \[8 \cdot 5\] | \[8 \cdot 4\] | \[9 \cdot 9\] | \[9 \cdot 8\] |
---|---|---|---|---|---|---|---|---|
\[24\] | \[56\] | \[72\] | \[48\] | \[64\] | \[40\] | \[32\] | \[81\] | \[72\] |
\[36\ :6\] | \[20\ :4\] | \[21\ :7\] | \[24\ :3\] | \[49\ :7\] | \[56\ :8\] | \[48\ :6\] | \[36\ :9\] | \[32\ :8\] |
\[6\] | \[5\] | \[3\] | \[8\] | \[7\] | \[7\] | \[8\] | \[4\] | \[4\] |
\[\boxed{\mathbf{21}\mathbf{.}}\]
\[7 \cdot 6 \Longrightarrow 42 - 9 \Longrightarrow 33 + 15 \Longrightarrow\]
\[\Longrightarrow 48 + 16 \Longrightarrow 64\ :8 \Longrightarrow 8 \cdot 9 \Longrightarrow\]
\[\Longrightarrow 72 - 23 \Longrightarrow 49\ :7 \Longrightarrow 7 \cdot 8 \Longrightarrow\]
\[\Longrightarrow 56\]
\[\boxed{\mathbf{22}\mathbf{.}}\]
\[1)\ 32\ :4 \cdot 8 = 8 \cdot 8 =\]
\[= 64\ (кубика) - в\ 8\ коробках.\]
\[2)\ 32\ :4 \cdot 6 = 8 \cdot 6 =\]
\[= 48\ (кубиков) - в\ 6\ коробках.\]
\[3)\ 32\ :4 \cdot 9 = 8 \cdot 9 =\]
\[= 72\ (кубика) - в\ 9\ коробках.\]
\[\boxed{\mathbf{23}\mathbf{.}\mathbf{\ }}\]
\[4 \cdot 8 = 32\]
\[7 \cdot 5 = 35\]
\[7 \cdot 9 = 63\]
\[5 \cdot 8 = 40\]
\[6 \cdot 5 = 30\]
\[8 \cdot 7 = 56\]
\[2 \cdot 9 = 18\]
\[8 \cdot 3 = 24\]
\[7 \cdot 7 = 49\]
\[9 \cdot 9 = 81\]
\[7 \cdot 6 = 42\]
\[6 \cdot 6 = 36\]