Решите пожалуйста дам 30 баллов!
(По действиям)
а) (7/15+7/30+4/5):(2-1/3-1/2)
б) (1/6+1/10+1/15):(3/5-1/3-1/4)

а) (7/15 + 7/30 + 4/5) : (2 - 1/3 - 1/2) = 1 2/71) 7/15 + 7/30 = 14/30 + 7/30 = 21/30 = 7/102) 7/10 + 4/5 = 7/10 + 8/10 = 15/10 = 1 5/103) 2 - 1/3 = 1 3/3 - 1/3 = 1 2/34) 1 2/3 - 1/2 = 1 4/6 - 3/6 = 1 1/65) 1 5/10 : 1 1/6 = 15/10 : 7/6 = 15/10 * 6/7 = 45/35 = 1 10/35 = 1 2/7б) (1/6 + 1/10 + 1/15) : (3/5 - 1/3 - 1/4) = 201) 1/6 + 1/10 = 5/30 + 3/30 = 8/30 = 4/152) 4/15 + 1/15 = 5/15 = 1/33) 3/5 - 1/3 = 9/15 - 5/15 = 4/154) 4/15 - 1/4 = 16/60 - 15/60 = 1/605) 1/3 : 1/60 = 1/3 * 60/1 = 60/3 = 20