\[\boxed{\mathbf{4.163}}\]
\[\textbf{а)}\ 52\ :2 = 26 + 24 = 50\ :25 =\]
\[= 2 \cdot 36 = 72\ :18 = 4\]
\[\textbf{б)}\ 72\ :24 = 3 \cdot 12 = 36 + 34 =\]
\[= 70\ :5 = 14 + 56 = 70\]
\[\textbf{в)}\ 95\ :5 = 19 + 56 = 75\ :3 =\]
\[= 25 \cdot 8 = 200 \cdot 3 = 600\]
\[\textbf{г)}\ 96\ :3 = 32 + 28 = 60\ :4 =\]
\[= 15 \cdot 5 = 75\ :25 = 3\]
\[\textbf{д)}\ 84\ :28 = 3 \cdot 18 = 54 + 46 =\]
\[= 100\ :20 = 5 \cdot 3 = 15\]