$7 \overset{3}{*} 4 \overset{6}{-} (19 \overset{1}{+} 6) \overset{4}{:} 5 \overset{7}{+} (32 \overset{2}{:} 4) \overset{5}{*} 8 = 28 - 25 : 5 + 8 * 8 = 28 - 5 + 64 = 23 + 64 = 87$
1) 19 + 6 = 25;
2) 32 : 4 = 8;
3) 7 * 4 = 28;
4) 25 : 5 = 5;
5) 8 * 8 = 64;
6) 28 − 5 = 23;
7) 23 + 64 = 87.
 
$(54 \overset{1}{:} 6) \overset{3}{*} (56 \overset{2}{:} 7) \overset{6}{-} 36 \overset{4}{:} 4 \overset{7}{+} 3 \overset{5}{*} 9 = 9 * 8 - 9 + 27 = 72 - 9 + 27 = 63 + 27 = 90$
1) 54 : 6 = 9;
2) 56 : 7 = 8;
3) 9 * 8 = 72;
4) 36 : 4 = 9;
5) 3 * 9 = 27;
6) 72 − 9 = 63;
7) 63 + 27 = 90.