S1=1*1=1см2
S2=6*2-1=12-1=11
Sфигуры=11+1=12см2
см2 это сантиметры квадратные
4-32
5 -30
6-30
7-28
8-32
9627
(2/3х + 1/8х) * 24 = 38,
16/24х + 3/24х = 38 : 24,
19/24х = 38/24,
х = 38/24 : 19/24,
х = 38/24 * 24/19,
х = 2,
Проверка:
(2/3*2 + 1/8*2) * 24 = 38,
(4/3 + 1/4) * 24 = 38,
(16/12 + 3/12) * 24 = 38,
19/12 * 24 = 38,
19*2 = 380
38 = 38