892. Начертите квадрат со стороной 6 клеток. Разделите его на 3 доли и закрасьте \frac{2}{3} квадрата. Какая часть квадрата осталась незакрашенной?

+-----+-----+-----+-----+-----+----+
|     |     |     |     |     |    |
+-----+-----+-----+-----+-----+----+
|     |     |     |     |     |    |
+-----+-----+-----+-----+-----+----+
|     |     |     |     |     |    |
+-----+-----+-----+-----+-----+----+
|     |     |     |     |     |    |
+-----+-----+-----+-----+-----+----+
|     |     |     |     |     |    |
+-----+-----+-----+-----+-----+----+
|     |     |     |     |     |    |
+-----+-----+-----+-----+-----+----+

Закрасим 2/3 квадрата:

+=====+=====+=====+-----+-----+----+
|/////|/////|/////|     |     |    |
+=====+=====+=====+-----+-----+----+
|/////|/////|/////|     |     |    |
+=====+=====+=====+-----+-----+----+
|/////|/////|/////|     |     |    |
+=====+=====+=====+-----+-----+----+
|/////|/////|/////|     |     |    |
+=====+=====+=====+-----+-----+----+
|/////|/////|/////|     |     |    |
+=====+=====+=====+-----+-----+----+
|/////|/////|/////|     |     |    |
+=====+=====+=====+-----+-----+----+

Осталась незакрашенной \frac{1}{3} квадрата.

Ответ: \frac{1}{3}