12 ч 10 мин-7 ч 35 мин+18 ч 58 мин=23 ч 32мин
24:17=48:34
24*34=816
17*48=816
11,25 если на 0,9
1125 если на 9
64 - 12 = 52. неиз. число
г) 10 - 5 * 6/5 - 1/3 = 11/3
1) 5 * 6/5 = 6
2) 10 - 6 = 4
3) 4 - 1/3 = 12/3 - 1/3 = 11/3
б) (3/5 - 4/15) * (1/2 - 1/3) = 1/18
1) 3/5 - 4/15 = 9/15 - 4/15 = 5/15 = 1/3
2) 1/2 - 1/3 = 3/6 - 2/6 = 1/6
3) 1/3 * 1/6 = 1/18
е) 11/34 * 8 + 9 * 11/34 = 11/34 * (8 + 9) = 11/34 * 17 = 11/2 = 5 1/2