ДРОБИ!!!!!!!!!!решите

(1/6 +2/3)*3 = (к общему знаменателю)= (1/6+4/6)*3=5/6*3=5/2=2.5
(17/30-2/15)/13=13/30 * 1/13 = 1/30
(1/8 - 3/4)/5 =  -5/8  *1/5= - 1/8
(4/3 +1/9 ) * 4 = 13/9 * 4 =52/9