\[\boxed{\mathbf{2}\mathbf{.}\mathbf{26}}\]
\[\textbf{а)}\ 20 - 3 = 17\]
\[40 - 7 = 33\]
\[50 - 27 = 23\]
\[60 - 15 = 45\]
\[70 - 13 = 57\]
\[\textbf{б)}\ 100 - 3 = 97\]
\[200 - 4 = 196\]
\[300 - 10 = 290\]
\[400 - 19 = 381\]
\[600 - 38 = 562\]
\[\textbf{в)}\ 154 + 8 = 162\]
\[484 + 6 = 490\]
\[538 + 4 = 542\]
\[627 + 19 = 646\]
\[218 + 32 = 250\]
\[\textbf{г)}\ 60\ :60 = 1\]
\[60\ :3 = 20\]
\[130\ :1 = 130\]
\[140 \cdot 1 = 140\]
\[350\ :5 = 70\]
\[\textbf{д)}\ 25 \cdot 2 = 50\]
\[14 \cdot 3 = 42\]
\[16 \cdot 4 = 64\]
\[18 \cdot 5 = 90\]
\[19 \cdot 6 = 114\]