Х+2/11=5

26 5/8+а=30

n-65/66=2/9

11 1/4-x=3 7/10

1) х + 2/11 = 5

х = 5 - 2/11

х = (55-2) / 11

х=53/11

х = 4 9/11

2) 26 5/8+а=30

а=30 - 26 5/8

а = 29 8/8 - 26 5/8

а = 3 3/8

3) n-65/66=2/9

n = 65/66 = 2/9

n = 44/198 + 195/198

n = 239/198

n = 1 41/198

4) 11 1/4-x=3 7/10

-х = 3 7/10 - 11 1/4

-х = 3 14/20 - 10 25/20

-х = - 7 11/20

х = 7 11/20