2. Вычислите: 27/40 : 18/16 + 9/16.

27/40 : 18/16 + 9/16 = 27/40 * 16/18 + 9/16 = (27*16)/(40*18) + 9/16 = 432/720 + 9/16 = 3/5 + 9/16 = (3*16 + 9*5)/(5*16) = (48+45)/80 = 93/80