Выполните действия а) 8\9 -5\12; б) 7\15+7\12;в) 5\21+5\28;г) 11\42-5\28
А) 8/9-5/12= 32/36-15/36= 17/36 б) 7/15+7/12= 28/60+35/60= 63/60=21/20= 1 цел 1/20=1,05 в) 5/21+5/28= 20/84+15/84= 35/84=5/12 г) 11/42-5/28=22/84-15/84= 7/84=1/12
А)8/9 - 5/12 = 32/36 - 15/36= 17/36 б)7/15 +7/12 =28/60 + 35/60 = 63/60 =13/60 в)5/21 + 5/28 = 20/84 + 15/84 = 35/84 г)11/42 - 5/28= 22/84-15/84 = 7/84