7 минут 7/60
15/60 ИЛИ 1/4
1/80
1/70
3/2
2/1
1/2
2/3
(45+825) : (51:17) =290
1. 45 + 825 = 870
2. 51:17=3
3.870:3=290
(11×123) ×21=28413
1. 11×123=1353
2. 1353×21=28413
52988:(37+29)=
1. 37+29=66
2.52988:66= 802,8484848485
1)100000:100*80=80000(монет)- золотых монет в казане
<span>Z-4.9z=4.5
</span>-3.9z=4.5;
z=-1.15.