5а+2б при а=7/15 б=-5/6

Question

5а+2б при а=7/15 б=-5/6

Answer 1

5*7/15+2*(-5/6)=
1)5*7/15=5/1*7/15=7/3=2 1/3
2)2*(-5/6)=2/1*(-5/6)=-5/3=-1 2/3
3)2 1/3+(-1 2/3)=7/3+(-5/3)=7/3-5/3=2/3