Давайте посчитаем:
7/18 - 0.2 + 1/9 = (7/18) - 0.2 + (2/18) = (7/18 + 2/18) - 0.2 = 9/18 - 0.2 = 0.5 - 0.2 = 0.3
8/25 + 7/20 - 0.47 = (8/25) + (7/20) - 0.47 = (32/100) + (35/100) - 47/100 = (32 + 35 - 47)/100 = 20/100 = 0.2
Ответ: 0.3 и 0.2.
Давайте посчитаем:
7/18 - 0.2 + 1/9 = (7/18) - 0.2 + (2/18) = (7/18 + 2/18) - 0.2 = 9/18 - 0.2 = 0.5 - 0.2 = 0.3
8/25 + 7/20 - 0.47 = (8/25) + (7/20) - 0.47 = (32/100) + (35/100) - 47/100 = (32 + 35 - 47)/100 = 20/100 = 0.2
Ответ: 0.3 и 0.2.