Ответ:
а) \(6\frac{4}{11}-2\frac{1}{3}=4+\frac{4}{11}-\frac{1}{3}=4+\frac{12-11}{33}=4\frac{1}{33}\).
б) \(2\frac{5}{18}+6\frac{1}{2}=8+\frac{5}{18}+\frac{9}{18}=8\frac{14}{18}=8\frac{7}{9}\).
в) \(\frac{3}{7}:\frac{7}{11}=\frac{3}{7}\cdot\frac{11}{7}=\frac{33}{49}\).
г) \(\frac{5}{36}:\frac{30}{42}=\frac{5}{36}\cdot\frac{42}{30}=\frac{7}{36}\).
д) \(\left(\frac{6}{7}\right)^2=\frac{6^2}{7^2}=\frac{36}{49}\).
Ответ: а) \(4\frac{1}{33}\); б) \(8\frac{7}{9}\); в) \(\frac{33}{49}\); г) \(\frac{7}{36}\); д) \(\frac{36}{49}\).
