Пошаговое объяснение:
(30*х):25=60
30х=60*25
30х=1500
х= 1500:30
х=50
(30*50):25=60
60=60
389-х:70=349
х:70=389-349
х:70=40
х=40*70
х=2800
389-2800:70=349
349=349
(30 * х) : 25 = 60
30 * x = 60 * 25
30 * x = 1500
x = 1500 : 30
x = 50
(30 * 50) : 25 = 60
60 = 60
389 - х : 70 = 349
x : 70 = 389 - 349
x : 70 = 40
x = 40 • 70
x = 2800
389 - 2800 : 70 = 349
349 = 349
