1/3х+1/4х+1/5х=1 19/75 4 1/2÷х+1 3/4=3 19/28​

Пошаговое объяснение:

1) 1/3х + 1/4х + 1/5х = 1 19/75

1/3х + 1/4х + 1/5х = 94/75

100х + 75х + 60х = 376

235х = 376

х = 376:235

х = 8/5

х = 1 3/5

ответ : 1 3/5

4 1/2 : х + 1 3/4 = 3 19/28

9/2 + 1/х + 7/4 = 103/28

9/2х = 103/28 - 7/4

9/2х = 27/14

126 = 54х

54х = 126

х = 126 : 54

х = 7/3

х = 2 1/3

ответ: 2 1/3