(8 целых 7/12 - 2 целых 17/36)·* 2 целых 7/10 - 4 целых 1/3 / 13/20=

(8 7/12- 2 17/36) * 2 7/10 -4 1/3 : 13/20= 9 5/6 1) 8 7/12- 2 17/36= 8 21/36 - 2 17/36 = 6 4/36 = 6 1/9= 55/9 2) 55/9 *2 7/10= 55/9 *27/10= 165/10 = 16 1/2 3) 4 1/3 : 13/20= 13/3 * 20/13 = 20/3 = 6 2/3 4) 16 1/2 - 6 2/3= 16 3/6 - 6 4/6 =15 9/6 -6 4/6 = 9 5/6