(3 1/3 +5 1/6)*2/5-2 3/4 :(1 1/2-2/5) помогите решить

3 1/3 + 5 1/6 = 3 2/6 + 5 1/6 = 8 3/6 = 8 1/2

1 1/2-2/5= 1  5/10 - 4/10 = 1  1/10       

8 1/2 * 2/5 =17/2*2/5 = 17/5 = 3 2/5

2  3/4: 1  1/10= 11/4*10/11= 10/4=5/2= 2  1/2

3  2/5 - 2 1/2 = 3  4/10 - 2 5/10 = 2  14/10-2  5/10 = 9/10