А) (7/15 +7/30+4/5)разделить (2- 1/3-1/2)

Question

Математика: А) (7/15 +7/30+4/5)разделить (2- 1/3-1/2)

karuna4 · Answer

(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