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а) \(99\xrightarrow{+5}\) [ ] \(\xrightarrow{:4}\) [ ] \(\xrightarrow{\cdot 3}\) [ ] \(\xrightarrow{-60}\) [ ] \(\xrightarrow{\cdot 2}\) [ ] \(\xrightarrow{+4}\) [ ].

\(43\xrightarrow{-8}\) [ ] \(\xrightarrow{:7}\) [ ] \(\xrightarrow{+67}\) [ ] \(\xrightarrow{:3}\) [ ] \(\xrightarrow{\cdot 5}\) [ ] \(\xrightarrow{-25}\) [ ].

\(32\xrightarrow{\cdot 5}\) [ ] \(\xrightarrow{-72}\) [ ] \(\xrightarrow{+17}\) [ ] \(\xrightarrow{:5}\) [ ] \(\xrightarrow{\cdot 4}\) [ ].

\(33\xrightarrow{\cdot 4}\) [ ] \(\xrightarrow{+23}\) [ ] \(\xrightarrow{:5}\) [ ] \(\xrightarrow{-15}\) [ ] \(\xrightarrow{\cdot 4}\) [ ] \(\xrightarrow{+18}\) [ ].

б) [ ] \(\xrightarrow{:2}\) [ ] \(\xrightarrow{+15}\) [ ] \(\xrightarrow{-3}47\) .

[ ] \(\xrightarrow{\cdot 4}\) [ ] \(\xrightarrow{-12}\) [ ] \(\xrightarrow{:3}\) [ ] \(\xrightarrow{+4}20\) .

[ ] \(\xrightarrow{:9}\) [ ] \(\xrightarrow{+9}\) [ ] \(\xrightarrow{\cdot 5}\) [ ] \(\xrightarrow{:2}\) [ ] \(\xrightarrow{-25}30\) .

[ ] \(\xrightarrow{\cdot 2}\) [ ] \(\xrightarrow{+16}\) [ ] \(\xrightarrow{:5}\) [ ] \(\xrightarrow{-6}\) [ ] \(\xrightarrow{\cdot 5}\) [ ] \(\xrightarrow{-29}51\) .

в) \(16\xrightarrow{\cdot 4}\) [ ] \(\xrightarrow{+26}\) [ ] \(\xrightarrow{:5}\) [ ] \(\xrightarrow{-18}\) [ ].

[ ] \(\xrightarrow{\cdot 5}\) [ ] \(\xrightarrow{:4}\) [ ] \(\xrightarrow{-12}\) [ ] \(\xrightarrow{:8}1\) .

[ ] \(\xrightarrow{:7}\) [ ] \(\xrightarrow{\cdot 4}\) [ ] \(\xrightarrow{+22}\) [ ] \(\xrightarrow{:7}\) [ ] \(\xrightarrow{-10}0\) .