Условие:

648720 : 68 + 506 * 108 − 63295;
608 * 506 − 236 * 400 + 8716;
286996 : (1010 − 553) + 164268 : 324;
1000000 − (700800 + 425 * 704) + 25.

648720 : 68 + 506 * 108 − 63295 = 9540 + 54648 − 63295 = 64188 − 63295 = 893
1) $\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}648720\\ \phantom{0}\underset{¯}{612}\\ \phantom{0}\underset{¯}{\phantom{0}}367\\ \phantom{00}\underset{¯}{340}\\ \phantom{00}\underset{¯}{\phantom{0}}272\\ \phantom{000}\underset{¯}{272}\\ \phantom{00000}\underset{¯}{\phantom{0}}0\\ \phantom{000000}\underset{¯}{0}\\ \phantom{000000}0\end{array}& \begin{array}{l}\overline{)68}\\ \overline{\overline{)9540}}\end{array}\end{array}$;
2) $\begin{array}{r}\times \underset{¯}{\begin{array}{r}506\\ 108\end{array}}\\ 4048\\ 0\phantom{0}\\ 506\phantom{00}\\ \overline{54648}\end{array}$;
3) $\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}9540\\ 54648\end{array}}\\ \begin{array}{r}64188\end{array}\end{array}$;
4) $\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}64188\\ 63295\end{array}}\\ \begin{array}{r}893\end{array}\end{array}$.
 
608 * 506 − 236 * 400 + 8716 = 307648 − 94400 + 8716 = 213248 + 8716 = 221964
1) $\begin{array}{r}\times \underset{¯}{\begin{array}{r}608\\ 506\end{array}}\\ 3648\\ 0\phantom{0}\\ 3040\phantom{00}\\ \overline{307648}\end{array}$;
2) $\begin{array}{r}\times \underset{¯}{\begin{array}{r}236\\ 4\end{array}}\\ 944\end{array}$;
3) $\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}307648\\ 94400\end{array}}\\ \begin{array}{r}2132428\end{array}\end{array}$;
4) $\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}2132428\\ 8716\end{array}}\\ \begin{array}{r}221964\end{array}\end{array}$.
 
286996 : (1010 − 553) + 164268 : 324 = 286996 : 457 + 164268 : 324 = 628 + 507 = 1135
1) $\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}1010\\ 553\end{array}}\\ \begin{array}{r}457\end{array}\end{array}$;
2) $\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}286996\\ \phantom{0}\underset{¯}{2742}\\ \phantom{0}\underset{¯}{\phantom{0}}1279\\ \phantom{000}\underset{¯}{914}\\ \phantom{00}\underset{¯}{\phantom{0}}3656\\ \phantom{000}\underset{¯}{3656}\\ \phantom{000000}0\end{array}& \begin{array}{l}\overline{)457}\\ \overline{\overline{)628}}\end{array}\end{array}$;
3) $\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}164268\\ \phantom{0}\underset{¯}{1620}\\ \phantom{00}\underset{¯}{\phantom{0}}226\\ \phantom{00000}\underset{¯}{0}\\ \phantom{00}\underset{¯}{\phantom{0}}2268\\ \phantom{000}\underset{¯}{2268}\\ \phantom{000000}0\end{array}& \begin{array}{l}\overline{)324}\\ \overline{\overline{)507}}\end{array}\end{array}$;
4) $\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}628\\ 507\end{array}}\\ \begin{array}{r}1135\end{array}\end{array}$.
 
1000000 − (700800 + 425 * 704) + 25 = 1000000 − (700800 + 299200) + 25 = 1000000 − 1000000 + 25 = 0 + 25 = 25
1) $\begin{array}{r}\times \underset{¯}{\begin{array}{r}425\\ 704\end{array}}\\ 1700\\ 0\phantom{0}\\ 2975\phantom{00}\\ \overline{299200}\end{array}$;
2) $\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}700800\\ 299200\end{array}}\\ \begin{array}{r}1000000\end{array}\end{array}$;
3) 1000000 − 1000000 = 0;
4) 0 + 25 = 25.