Question

3/7*7/9 пожалуйста и 5/8*1 13/15*2 2/7 пошагово срочно

Answer 1

3/7*7/9 =3*7/(7*9)=3/9=1/3.
5/8*1 13/15*2 2/7 =5/8*28/15*16/7=5*28*16/(8*15*7)=2240/840=56/21=2 2/3.