(7/15 + 7/30 + 4/5) : (2 - 1/3 - 1/2) = 1 2/7
1) 7/15 + 7/30 = (7*2)/(15*2) + 7/30 = 14/30 + 7/30 = 21/30
2) 21/30 + 4/5 = 21/30 + (4*6)/(5*6) = 21/30 + 24/30 = 45/30
3) 2 - 1/3 = 1 3/3 - 1/3 = 1 2/3
4) 1 2/3 - 1/2 = 1 4/6 - 3/6 = 1 1/6 = 7/6
5) 45/30 : 7/6 = 45/30 * 6/7 = 9/7 = 1 2/7
ответ: 1 2/7
(7/15 + 7/30 + 4/5) : (2 - 1/3 - 1/2) = 1 2/7
1) 7/15 + 7/30 = (7*2)/(15*2) + 7/30 = 14/30 + 7/30 = 21/30
2) 21/30 + 4/5 = 21/30 + (4*6)/(5*6) = 21/30 + 24/30 = 45/30
3) 2 - 1/3 = 1 3/3 - 1/3 = 1 2/3
4) 1 2/3 - 1/2 = 1 4/6 - 3/6 = 1 1/6 = 7/6
5) 45/30 : 7/6 = 45/30 * 6/7 = 9/7 = 1 2/7
ответ: 1 2/7