1-60*6+40/5=400/5=80 сек
2-60*3+46 сек+60*2+74=226+194=420 сек
1) 2,783 * (-1) = 2,783
2) (-1) * 13 2/7 = -13 2/7
3) 3,21 * (-2) = -6,42
4) (-3/8) * 12 = -9/4 = -2 1/2
5) (-100) * 0,087 = -8,7
6) 3/4 * (-8/9) = -2/3
100 * 125 = 12500 Кб с
100 / 12500 = 0,008 с
4 - 7/19 = 3 19/19 - 7/19 = 3 12/19
Ответ: 3 12/19.
15/35 =3/7, 30/70=3/7,
92/100=23/25, 23/25
15/50=3/10, 3/10
88/16=11/2, 11/2
56/8=7
63/210=9/70
42/51=14/17, 126/153=14/17, 14/17, 70/85=14/17
36/84=9/21
121/11=11, 33/11=11
48/102=24/51