Выполните действия 5/6-3/4= 9/14+8/21= 7/9+5/12-3/4=

Question

Выполните действия
5/6-3/4=
9/14+8/21=
7/9+5/12-3/4=

Answer 1

5/6–3/4 = 10/12 – 9/12 =1/12
9/14+8/21= 27/42 + 16/42 = 43/42=1 цел 1/42
7/9 + 5/12 – 3/4 = 28/36 + 15/36 – 27/36 = 16/36 = 4/9