2.1*3.5/4.9 |=> 7.35/4.9 |=> 1.5
Ответ: 1.5
1. 1) <span>739 + 245 = 984
2) 31*29 = 899
3) 984:82 = 12
4) 12 + 899 = 911
2. 1) </span><span>469 - 398 = 71
</span><span> 2) 13*71 = 923
3) 42*21 =882
4) 882:63 =14
5) 923 - 14 = 909
<em> Вроде так.</em>
</span>
1) 3 5/8 * 0.48 = 9/10
3.625 * 0.52 = 1.885
9.10 + 1.885 = 2.785
Обратное число - 2.785
2) 17 8/15 * 3.8 = 66 47/75
7 8/15 * 3.8 = 28 47/75
66 47/75 - 28 47/75 = 38
2 ВАРИАНТ:
3.8 * (17 8/15 - 7 8/15) =
1 действие: 17 8/15 - 7 8/15 = 10
2 действие: 3.8 * 10 = 38