Вероника9 лет назад
а ) 54 / 72 = 9 * 6 / ( 12 * 6 ) = 9 * 1 / ( 12 * 1 ) = 9 / 12 = 3 * 3 / ( 3 * 4 ) = 3 * 1 / ( 1 * 4 ) = 3 / 4 = 0.75 ;
75 / 120 = 3 * 25 / ( 3 * 40 ) = 25 / 40 = 5 * 5 / ( 5 * 8 ) = 5 / 8 ;
17 / 51 = 17 / ( 3 * 17 ) = 1 / ( 3 * 1 ) = 1 / 3 ;
150 / 180 = 15 * 10 / ( 18 * 10 ) = 15 / 18 = 3 * 5 / ( 6 * 3 ) = 5 / 6 ;
б ) 18 * 13 / 39 / 6 = 18 * 13 * 6 / 39 = 18 * 13 * 6 / ( 13 * 3 ) = 18 * 6 / 3 = 6 * 6 = 36 ;
6 * 35 / 42 * 12 = 6 * 5 * 7 / ( 7 * 6 * 12 ) = 5 / 12.