решите дробь пожалуйста 5 класс 1)6 6/7*3/8 2)2 22/25*1 13/24 3)1 8/9*1 1/8*2 2/3 4)9/10a*3 1/3b

6 6/7 * 3/8 = 48/7*3/8 = 48/8*3/7 = 6*3/7 = 18/7 = 2 4/7

2 22/25 * 1 13/24 = 72/25*37/24 = 72/24*37/25 = 3*37/25 = 111/25 = 4 11/25

1 8/9 * 1 1/8 * 2 2/3 = 17/9*9/8*8/3 = 9/9*8/8*17/3 = 17/3 = 5 2/3

9/(10a) * 3 1/(3b) = 9/(10a)*(9b+1)/(3b) = 9/(3b)*(9b+1)/(10a) =

= 3/b*(9b+1)/(10a) = (27b+3)/(10ab)