\[\boxed{\mathbf{3.}\mathbf{318}\mathbf{.ОК\ ГДЗ - домашка\ на\ }5}\]
\[\textbf{а)}\ 90 - 16 = 74\ :2 =\]
\[= 37 + 23 = 60\ :5 = 12\]
\[\textbf{б)}\ 50 + 19 = 69\ :3 =\]
\[= 23 + 47 = 70\ :5 = 14\]
\[\textbf{в)}\ 42 + 26 = 68\ :2 =\]
\[= 34 - 16 = 18 \cdot 3 = 54\]
\[\textbf{г)}\ 60 - 22 = 38\ :2 =\]
\[= 19 + 46 = 65\ :5 = 13\]
\[\textbf{д)}\ 70 - 19 = 51\ :3 =\]
\[= 17 + 13 = 30 \cdot 5 = 150\]