5/12 - 1/3 ; 1/5 - 3/20 ; 7/8 - 5/12 ; 9/10 - 1/6 . Выполните вычитание и проверти сложением . 18 балов кто ответит правильно !
5/12 - 1/3= 5/12-4/12= 1/12 1/12+4/12= 5/12 1/5 - 3/20= 4/20-3/20= 1/20 1/20+3/20=4/20 7/8 - 5/12= 21/24-10/24= 11/24 ; 11/24+10/24= 21/24= 7/8 19/10 - 1/6= 57/30-5/30= 52/30= 1 22/30= 1 11/15 52/30+5/30=57/30= 19/10
5 1 5 5 1 3 4 3 1 7 5 21 10 11 --- - --- = --- - --- = 0 ; --- - --- = --- - --- = --- ; --- - --- = --- - --- = --- ; 12 3 12 12 5 20 20 20 20 8 12 24 24 24 9 1 27 5 22 --- - --- = --- - --- = --- ; 10 6 30 30 30