Ответ:
Пошаговое объяснение:
(3 1/2х - 1/4) * 8 = 3
7/2х - 1/4 = 3/8
7/2х = 3/8 + 1/4 = 5/8
х = 5/8 : 7/2 = 5/8 * 2/7 = 5/28
(2/3х + 1/8х) * 24 = 38
19/24 х * 24 = 38
19/24х = 19/12
х = 19/12 : 19/24 = 19/12 * 24/19 = 2
6,7х + 3х + 63,5 = 500
9,7х + 63,5 = 500
9,7х = 500-63,5 = 436,5
х = 436,5 : 9,7 = 45