Question

помогите решить под б

Answer 1

$frac{1-frac{1}{frac{3}{4}+1}}{3}=frac{1}{3}-frac{1}{3*(frac{3}{4}+1)}=frac{1}{3}-frac{1}{3*frac{7}{4}}=\=frac{1}{3}-frac{1}{frac{21}{4}}=frac{1}{3}-frac{4}{21}=frac{1*7}{3*7}-frac{4}{21}=frac{7}{21}-frac{4}{21}=frac{7-4}{21}=frac{3}{21}=frac{1}{7}$

Answer 2

по русски напиши пож