(9 12/25-8 16/25)+4 17/25.
(9 12/25-8 16/25)+4 17/25.1)912 / 25 = 36,48 2)816 / 25 = 32,64 3)36,48 − 32,64 = 3,84 4)417 / 25 = 16,68 5)3,84+16,68 = 20,52