Помогите (1 3/5+1,8)×1/2

Question

Помогите (1 3/5+1,8)×1/2

Answer 1

1 3/5 = 8/5
1,8 = 18/10 = 9/5

(1 3/5 + 1,8) * 1,2 = (8/5 + 9/5) * 1/2 =
= (8+9) / 5 * 1/2 = 
= 17/5 * 1/2 = 
   17 * 1      17
=  5 * 2  =   10 =  1,7