Question

5/6а+3/5а-19/30а,если а=3 целых1/8

Answer 1

a(5/6+3/5-19/30)=a(5*5/30 + 3*6/30 - 19/30)=a(25/30+18/30-19/30)=a*24/30=
a*4/5= 25/8*4/5=5*2=10