Найдите значение выражения (3 1/6-2 7/16): 1 2/5

(3 1/6 - 2 7/16) : 1 2/5 = 25/48 

1) 3 1/6 - 2 7/16 = 3 8/48 - 2 21/48 = 2 56/48 - 2 21/48 = 35/48
2) 35/48 : 1 2/5 = 35/48 : 7/5 = 35/48 * 5/7 = (5*5)/(48*1) = 25/48