Найти среднее арифмитическое чисел:3.25 и 1 1/4 3 7/20; 1 2/5 и 4.15
3,25 = 3 25/100 = 3 1/4 (3 1/4 + 1 1/4) : 2 = 4 2/4 : 2 = 4 1/2 : 2 = 9/2 * 1/2 = 9/4 = 2 1/4 4,15 = 4 15/100 = 4 3/20 3 7/20 + 1 2/5 + 4 3/20 = (3 7/20 + 1 8/20 + 4 3/20) : 3 = 8 18/20 : 3 = 8 9/10 : 3 = 89/10 * 1/3 = 89/30 = 2 29/30