выполните сложение:1 1/3 +2/3 ;2 3/5 +3 4/15 ; 9 1/9+1 8/9 выполните вычитание:1 13/18-13/18; 5 11/15-5 8/15 ;1 13/15; 113/15-17/20
(1 1/2 + 2/3)х6 = (3/2 + 2/3)х6 = (9/6 + 4/6)х6 = 13/6х6=13 ; (2 1/2 + 1 1/3) : 1/6 - 2 3/7 =( 5/2 +4/3) :1/6 - 2 3/7 = (15/6 + 8/6) :1/6 - 2 3/7 = = 23/6 :1/6 - 2 3/7 = 23 - 2 3/7 = 20 4/7 (1 3/5 + 2 1/5): 1 9/10 + (1 7/10 - 4/5): 3/7 = 3 4/5 :1 9/10 + (17/10 - 8/10) : 3/7 = = 19/5 Х 10/19 + 9/10 Х 7/3 = 2 + 2 1/10 = 4 1/10 ; 1 8/93 1/6-1 3/4)= 1 8/919/6 - 7/4) = 1 8/9: 38-21/12 = 1 8/9:17/12 = = 17/9 Х 12/17 = 12/9 = 4/3 = 1 1/3 уже второй раз спрашиваешь бедная)