Question

1,(63) ÷ ( 3 supra 11 )² - 20,4​

Answer 1

$1,(63)=\frac{163-1}{99}=\frac{162}{99}=\frac{18}{11}.$

$(\frac{3}{11})^2=\frac{9}{121}.$

$20,4=\frac{204}{10}=\frac{102}{5}.$

$\frac{18}{11}:\frac{9}{121}-\frac{102}{5}=\\ \\ \frac{18}{11}*\frac{121}{9}-\frac{102}{5}=\\ \\ 22-\frac{102}{5}=\frac{110-102}{5}=\frac{8}{5}=1,6.$

@robertinnifd