4/12-1/4 = 1/12
Б)22/27-5/9 = 22/27 - 15/27 = 7/27
в)3/10 - 43/1000 = 300/1000 - 43/1000 = 257/1000
г)31/100-21/100 = 10/100 = 1/10
а)5/8-1/2 = 1/8
б)12/18-5/6 = 12/18 - 15/18 = 3/18 = 1/6
¢в)7/8-11/24 = 21/24 -11/24 = 10/24 = 5/12
г)777/1000-1/10 = 777/1000 - 100/1000 = 677/1000