2) x=3
3) x=4
Пошаговое объяснение:
2) 1/x-1/7x=2/7
7-1=2x
6=2x
x=6:2
x=3
3) 1/4x+1/x=5/16
4+16=5x
20=5x
x=20:5
x=4
1) 1/x -1/7x = 2/7
6/7x = 2/7
14x=42
2) 1/4x + 1/x = 5/16
5/4x = 5/16
4x = 16
x = 4
