Пошаговое объяснение:
1. 68120I65
///65 I1048
///312
///260
520
0
65*1048=68120
2. 77110I22
66 I3505
111
110
22*3505 = 77110
3. 302520I12
24 I25210
62
60
25
24
12
25210*12=302520