Угол ЕОВ = угол АОВ - FOB = 180 - 150 = 30
AOF = EOB = 30
<span>EOC = COB - FOB = 90 - 40 = 60 </span>
13+3.2х+0.4 = 40
13.4 + 3.2х = 40
3.2х = 40 - 13.4
3.2х = 26.6
Х= 133/16 , Х= 8 целых 5/16
Вот такой ответ _________
1) 924:7*3=396, 2) 180: 45*8=32, 3) 120:4*30=900, 4) 388:4*9=873