$6 \overset{2}{*} 9 \overset{5}{-} 48 \overset{3}{:} 8 \overset{4}{*} (13 \overset{1}{-} 4) = 0$
1) 13 − 4 = 9;
2) 6 * 9 = 54;
3) 48 : 8 = 6;
4) 6 * 9 = 54;
5) 54 − 54 = 0.
 
$(7 \overset{1}{*} 7) \overset{6}{:} (5 \overset{2}{*} 5 \overset{4}{+} 6 \overset{3}{*} 4) \overset{8}{-} (9 \overset{5}{-} 9) \overset{7}{*} 3 = 1$
1) 7 * 7 = 49;
2) 5 * 5 = 25;
3) 6 * 4 = 24;
4) 25 + 24 = 49;
5) 9 − 9 = 0;
6) 49 : 49 = 1;
7) 0 * 3 = 0;
8) 1 − 0 = 1.