4-(1 3/7-1 1/18) =

Решим пример: $$4-(1 \frac{3}{7}-1 \frac{1}{18})$$

1. $$1 \frac{3}{7}-1 \frac{1}{18} = 1 \frac{54}{126} - 1 \frac{7}{126} = \frac{47}{126}$$
2. $$4 - \frac{47}{126} = 3 \frac{126}{126} - \frac{47}{126} = 3 \frac{79}{126}$$

Ответ: 3 79/126