408 * 270 + 21008 : 808 = 110160 + 26 = 110186
1) $\begin{array}{r}\times \underset{¯}{\begin{array}{r}408\\ 27\end{array}}\\ 2856\\ 816\phantom{0}\\ \overline{11016}\end{array}$;
2) ;
3) 110160 + 26 = 110186.
 
71370 : 234 + 695 * 50 = 305 + 34750 = 35055
1) $\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}71370\\ \phantom{0}\underset{¯}{702}\\ \phantom{0}\underset{¯}{\phantom{0}}117\\ \phantom{0000}\underset{¯}{0}\\ \phantom{0}\underset{¯}{\phantom{0}}1170\\ \phantom{00}\underset{¯}{1170}\\ \phantom{00000}0\end{array}& \begin{array}{l}\overline{)234}\\ \overline{\overline{)305}}\end{array}\end{array}$;
2) $\begin{array}{r}\times \underset{¯}{\begin{array}{r}695\\ 5\end{array}}\\ 3475\end{array}$;
3) $\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}34750\\ 305\end{array}}\\ \begin{array}{r}35055\end{array}\end{array}$.
 
280084 : 28 − 125 * 8 = 10003 − 1000 = 9003
1) $\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}280084\\ \phantom{0}\underset{¯}{28}\\ \phantom{00}\underset{¯}{\phantom{0}}0\\ \phantom{000}\underset{¯}{0}\\ \phantom{000}\underset{¯}{\phantom{0}}0\\ \phantom{0000}\underset{¯}{0}\\ \phantom{0000}\underset{¯}{\phantom{0}}8\\ \phantom{00000}\underset{¯}{0}\\ \phantom{0000}\underset{¯}{\phantom{0}}84\\ \phantom{00000}\underset{¯}{84}\\ \phantom{000000}0\end{array}& \begin{array}{l}\overline{)28}\\ \overline{\overline{)10003}}\end{array}\end{array}$;
2) $\begin{array}{r}\times \underset{¯}{\begin{array}{r}128\\ 8\end{array}}\\ 1024\end{array}$;
3) $\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}10003\\ 1000\end{array}}\\ \begin{array}{r}9003\end{array}\end{array}$.
 
(327 + 541350 : 450) : 3 = (327 + 1203) : 3 = 1530 : 3 = 510
1) $\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}541350\\ \phantom{0}\underset{¯}{450}\\ \phantom{0}\underset{¯}{\phantom{0}}913\\ \phantom{00}\underset{¯}{900}\\ \phantom{00}\underset{¯}{\phantom{0}}135\\ \phantom{00000}\underset{¯}{0}\\ \phantom{00}\underset{¯}{\phantom{0}}1350\\ \phantom{000}\underset{¯}{1350}\\ \phantom{000000}0\end{array}& \begin{array}{l}\overline{)450}\\ \overline{\overline{)1203}}\end{array}\end{array}$;
2) $\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}1203\\ 327\end{array}}\\ \begin{array}{r}1530\end{array}\end{array}$;
3) $\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}1530\\ \phantom{0}\underset{¯}{15}\\ \phantom{00}\underset{¯}{\phantom{0}}3\\ \phantom{000}\underset{¯}{3}\\ \phantom{000}\underset{¯}{\phantom{0}}0\\ \phantom{0000}\underset{¯}{0}\\ \phantom{0000}0\end{array}& \begin{array}{l}\overline{)3}\\ \overline{\overline{)510}}\end{array}\end{array}$.
 
(31460 + 1040) : (150 − 2400 : 120) = 32500 : (150 − 20) = 32500 : 130 = 250
1) $\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}31460\\ 1040\end{array}}\\ \begin{array}{r}32500\end{array}\end{array}$;
2) 2400 : 120 = 20;
3) 150 − 20 = 130;
4) $\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}32500\\ \phantom{0}\underset{¯}{260}\\ \phantom{0}\underset{¯}{\phantom{0}}650\\ \phantom{00}\underset{¯}{650}\\ \phantom{0000}\underset{¯}{\phantom{0}}0\\ \phantom{00000}\underset{¯}{0}\\ \phantom{00000}0\end{array}& \begin{array}{l}\overline{)130}\\ \overline{\overline{)250}}\end{array}\end{array}$.
 
(78213 − 75209) * 207 − 45 * 308 = 3004 * 207 − 13860 = 621828 − 13860 = 607968
1) $\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}78213\\ 75209\end{array}}\\ \begin{array}{r}3004\end{array}\end{array}$;
2) $\begin{array}{r}\times \underset{¯}{\begin{array}{r}3004\\ 207\end{array}}\\ 21028\\ 0\phantom{0}\\ 6008\phantom{00}\\ \overline{621828}\end{array}$;
3) $\begin{array}{r}\times \underset{¯}{\begin{array}{r}308\\ 45\end{array}}\\ 1540\\ 1232\phantom{0}\\ \overline{13860}\end{array}$;
4) $\begin{array}{r}\begin{array}{r}-\end{array}\underline{\begin{array}{r}621828\\ 13860\end{array}}\\ \begin{array}{r}607968\end{array}\end{array}$.
 
(992341 : 269 + 780) − 325 : 5 = (3689 + 780) − 325 : 5 = 4469 − 65 = 4404
1) $\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}992341\\ \phantom{0}\underset{¯}{807}\\ \underset{¯}{\phantom{0}}1853\\ \phantom{0}\underset{¯}{1614}\\ \phantom{0}\underset{¯}{\phantom{0}}2394\\ \phantom{00}\underset{¯}{2152}\\ \phantom{00}\underset{¯}{\phantom{0}}2421\\ \phantom{000}\underset{¯}{2421}\\ \phantom{000000}0\end{array}& \begin{array}{l}\overline{)269}\\ \overline{\overline{)3689}}\end{array}\end{array}$;
2) $\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}3689\\ 780\end{array}}\\ \begin{array}{r}4469\end{array}\end{array}$;
3) $\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}325\\ \phantom{0}\underset{¯}{30}\\ \phantom{0}\underset{¯}{\phantom{0}}25\\ \phantom{00}\underset{¯}{25}\\ \phantom{000}0\end{array}& \begin{array}{l}\overline{)5}\\ \overline{\overline{)65}}\end{array}\end{array}$;
4) 4469 − 65 = 4404.
 
434280 : 517 * 306 + 27449 = 840 * 306 + 27449 = 257040 + 27449 = 284489
1) $\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}434280\\ \phantom{0}\underset{¯}{4136}\\ \phantom{0}\underset{¯}{\phantom{0}}2068\\ \phantom{00}\underset{¯}{2068}\\ \phantom{00000}\underset{¯}{\phantom{0}}0\\ \phantom{000000}\underset{¯}{0}\\ \phantom{000000}0\end{array}& \begin{array}{l}\overline{)517}\\ \overline{\overline{)840}}\end{array}\end{array}$;
2) $\begin{array}{r}\times \underset{¯}{\begin{array}{r}306\\ 84\end{array}}\\ 1224\\ 2448\phantom{0}\\ \overline{25704}\end{array}$;
3) $\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}257040\\ 27449\end{array}}\\ \begin{array}{r}284489\end{array}\end{array}$.