хелп!!!!!!!!!!!!!!!!!!!!

5 2/9 :  6 4/15 - 1,2 = 5/6 - 1 1/5 = -11/30

8,1 * 2/3 - 8,1 * 5/9 = 8,1(6/9 - 5/9) = 8,1 * 1/9 = 0,9

(3/4 : 0,75 - 5/9 *(3 - 1 1/5))/ (4/15 *  2,5) = (1 - 5/9* 1,8)/ 2/3 = 0 * 3/2 = 0