Răspuns :
ab+ac=2/15 + 11/75
a(b+c)= 2/15 +11/75 aducem la acelasi numitor
a(b+c)= (10+11)/75= 21/75= 7/25
a(b+c)= 2/15 +11/75 aducem la acelasi numitor
a(b+c)= (10+11)/75= 21/75= 7/25