Приведите дроби к наименьшему общему знаменателю а) 2/5и1/20, б) 7/12и5/24 в) 2/3и3/4 г) 1/7и5/8 д) 2/11и3/10 е) 2/3и

а) 2/5 = (2 * 4)/(5 * 4) = 8/20 и 1/20; б) 7/12 = (7 * 2)/(12 * 2) = 14/24 и 5/24; в) 2/3 = (2 * 4)/(3 * 4) = 8/12 и 3/4 = (3 * 3)/(4 * 3) = 9/12; г) 1/7 = (1 * 8)/(7 * 8) = 8/56 и 5/8 = (5 * 7)/(8 * 7) = 35/56; д) 2/11 = (2 * 10)/(11 * 10) = 20/110 и 3/10 = (3 * 11)/(10 * 11) = 33/110; е) 2/3 = (2 * 9)/(3 * 9) = 18/27 и 4/27.