Question

1) (1 3/5 + 1,8)*1/2

Answer 1

(1 3/5 + 1,8)*1/2 = (1,6 + 1,8) * 0,5 = 3,4 * 0,5 = 1,7
или так
(1 3/5 + 1,8)*1/2 = (1 3/5 + 1 8/10) * 1/2 = (1 3/5 + 1 4/5) * 1/2 = 2 7/5 * 1/2 = 17/5 * 1/2 = 17/10 = 1 7/10 = 1,7

Answer 2

спасибо большое!!!