Question

1) Daca a * = -2/5 si a * c - 1/3 atunci:
a) a * (b + c)= ?
b_ a * (b - c)= ?

Answer 1

a*b=-2/5
a*c=-1/3
a*(b+c)=a*b+a*c=-2/5+(-1/3)=-2/5-1/3=(-6-5)/15=-11/15
a*(b-c)=a*b-a*c=-2/5+1/3=(-6+5)/15=-1/15