Упр2. 53

а) \(\frac{4+7-1}{9}=\frac{10}{9}=1\frac{1}{9}\).

б) \(\frac67-\left(\frac57-\frac17\right)=\frac67-\frac47=\frac27\).

в) \(5\frac{6}{39}+4\frac{7}{78}=9\frac{12+7}{78}=9\frac{19}{78}\).

г) \(7\frac{13}{15}-3\frac{11}{30}=4\frac{26-11}{30}=4\frac12\).

д) \(\frac78\cdot\frac4{35}\cdot\frac{10}{9}=\frac19\).

е) \(\left(\frac12:\frac34-\frac49\right)\cdot\frac53=\left(\frac23-\frac49\right)\cdot\frac53=\frac{10}{27}\).