Question

Решить пример: 1 целая 1/2-1/6÷4/21

Answer 1

$1 \frac{1}{2} - \frac{1}{6} \div \frac{4}{21} = \frac{3}{2} - \frac{1 \times 21}{6 \times 4} = \frac{3}{2} - \frac{1 \times 7}{2 \times 4} = \frac{3}{2} - \frac{7}{8} = \frac{12 - 7}{8} = \frac{5}{8} = 0.625$