3/4 + 3 3/5 · (5/18 - 7/24) - 1/5 = 1/2
1) 5/18 - 7/24 = 20/72 - 21/72 = -1/72
2) 3 3/5 · (-1/72) = 18/5 · (-1/72) = -(1·1)/(5·4) = -1/20
3) 3/4 + (-1/20) = 15/20 - 1/20 = 14/20 = 7/10
4) 7/10 - 1/5 = 7/10 - 2/10 = 5/10 = 1/2
ответ: 1/2.
3/4 + 3 3/5 · (5/18 - 7/24) - 1/5 = 1/2
1) 5/18 - 7/24 = 20/72 - 21/72 = -1/72
2) 3 3/5 · (-1/72) = 18/5 · (-1/72) = -(1·1)/(5·4) = -1/20
3) 3/4 + (-1/20) = 15/20 - 1/20 = 14/20 = 7/10
4) 7/10 - 1/5 = 7/10 - 2/10 = 5/10 = 1/2
ответ: 1/2.