1)13613-8999=4614
2) 7373-1880=6493
3) 90×3=270
4) 9557-4614=85943
5) 85943+6493=93436
6) 92436+270=92706-ответ
<span>12/19 * (1 7/12 * 4 13/21) =
12/19 *(19/12 * 4 13/21) =
(12/19*19/12) * 4 13/21 =
1 * 4 13/21 = 4 13/21,
(3 2/7 * 25,8) * 7/23 =
(23/7 * 25,8) * 7/23 =
(23/7 * 7/23) * 25,8 =
1 * 25,8 = 25,8</span>