Решить примеры или дроби:

18/х=9

Х/6=4

5/7+9/х=7/8

11/18-4/9-1/х=0

1) 18/х = 9, х = 18 : 9, х = 2

2) х/6 = 4, х = 4 · 6, х = 24

3) 5/7 + 9/х = 7/8,

9/х = 7/8 - 5/9,

9/х = 63/72 - 40/72,

9/х = 23/72,

х = 9 : 23/72,

х = 9/1 · 72/23

х = 648/23 = 28 целых 4/23

4) 11/18 - 4/9 - 1/х = 0

11/18 - 8/18 - 1/х = 0

3/18 - 1/х = 0

1/6 - 1/х = 0

х = 6