\[\boxed{\text{5.477.}}\]
\[\textbf{а)}\ 200 - 74 = 126\ :7 =\]
\[= 18 + 52 = 70\ :7 = 10\]
\[\textbf{б)}\ 60 \cdot 3 = 180 + 120 =\]
\[= 300\ :75 = 4 \cdot 12 = 48\]
\[\textbf{в)}\ 56\ :8 = 7 \cdot 3 = 21 + 56 =\]
\[= 77\ :11 = 7\]
\[\textbf{г)}\ 720\ :8 = 90 + 15 =\]
\[= 105\ :5 = 21 \cdot 3 = 63\]