105600-79200=26400(км^2)площадь островов
105600/26400=4раза
9х - 45 + 24 - 4х = 3 + 3х + 20 - 2х
9х - 4х - 3х + 2х = 45 - 24 + 3 + 20
4х = 44
<u>х = 11</u>
Пошаговое объяснение:
2) (10/21)/ (2/3) = (10/21)* (3/2) = 5/7
4) (10/21)/ (5/21) = (10/21)* (21/5) = 2
6) (10/21)/ (10/7) = (10/21)* (7/10) = 1/3
8) (10/21)/ (21/10) = (10/21)* (10/21) = 100/441
10) (10/21)/ 2 = 5/21
(3 2/3+1 3/4):(6 7/12-2 1/4)*0,8=18 7/9
<span>3 2/3+1 3/4=3 8/12+1 9/12=4 17/12=5 5/12
</span>6 7/12-2 1/4=6 7/12-2 3/12=4 4/12=4 1/3
5 5/12:4 1/3=65/12:13/3=65/12*13/3=845/36
845/36*0,8=676/36=169/9=18 7/9