Вычислите: 2/3 – 5/18 : 15/27.

2/3 – 5/18 : 15/27 = 2/3 – (5/18 · 27/15) = 2/3 – (5 · 27) / (18 · 15) = 2/3 – 135 / 270 = 2/3 – 1/2 = (4 – 3) / 6 = 1/6