5 6 7 8 задание

5. \(\sqrt{(3a+b)^2}=3a+b=\frac{15}{13}+\frac{89}{13}=8\)

6. \(\sqrt{(4a+b)^2}=4a+b=\frac{12}{11}+\frac{65}{11}=7\)

7. \(\sqrt{(5a+b)^2}=5a+b=\frac{20}{9}+\frac{34}{9}=6\)

8. \(\sqrt{(6a+b)^2}=6a+b=\frac{24}{5}+\frac{41}{5}=13\)

Ответ: 5) 8; 6) 7; 7) 6; 8) 13.