1) a = 9.
9 * 11 = 99.
99 - 13 = 86.
86 > 60, => 86 / 2 = 43.
b = 43.
2) a = 5.
5 * 11 = 55.
55 - 13 = 42.
42 < 60, => 42 - 19 = 23.
b = 23.
3) a = 7.
7 * 11 = 77.
77 - 13 = 64.
64 > 60, => 64 / 2 = 32.
b = 32/
4) a = 4.
4 * 11 = 44.
44 - 13 = 31.
31 < 60, => 31 - 19 = 12.
b = 12.
5) a = 6.
6 * 11 = 66.
66 - 13 = 53.
53 < 60, => 53 - 19 = 34.
b = 34.
Множимо 4*80=320 4*100=400 потім 400+320=720; 800-720=80метрів
3/5 * 3/4 = 75/100 * 60/100 = 0,75 * 0,6 = 0,45 = 45/100 = 9/20
Xумножить19=76
x=76разделить19
x=4