Question

(1supra6-4supra15-7supra20):(1supra2+2supra5)+1supra4​

Answer 1

$( \frac{1}{6} - \frac{4}{15} - \frac{7}{20} ) \div ( \frac{1}{2} + \frac{2}{5} ) + \frac{1}{4} \\ \\ = \frac{10 - 16 - 21}{60} \div \frac{5 + 4}{10} + \frac{1}{4} \\ \\ = \frac{ - 27}{60} \div \frac{9}{10} + \frac{1}{4} \\ \\ = - \frac{9}{20} \times \frac{10}{9} + \frac{1}{4} \\ \\ = - \frac{1}{2} + \frac{1}{4} \\ \\ = - \frac{1}{4}$