Найдите значение выражения 3 - 2/5 * 3 1/3 -3 : 5 1/4 - 2 1/2 :7/8 7/8 * 2 2/3 + (-5/6) :2 1/7 1/5 - (1 1/2 -1 2/7 * 7/18) Помогите решить

3- 2/5 * 3.1/3=3 - 2/5*10/3=3 - 4/3= 3 - 1.1/3=1. 2/3 -3 : 5. 1/4 - 2. 1/2 : 7/8= - 3/1*4/21 - 5/2 * 8/7= - 4/7 - 20/7 = - 24/7 =  - 3. 3/7 7/8 * 2. 2/3 + (-5/6): 2. 1/7= 7/8 * 8/3 - 5/6 * 7/15= 7/3 - 7/18 =  42/18 - 7/18= 35/18= 1. 17/18 1/5 - (1.1/2 - 1. 2/7 * 7/18) = 1/5 - (3/2 - 9/7* 7/18)= 1/5 - (3/2-1/2)= 1/5 - 1= - 4/5