5. Вычислите: √25 − √49; √64 : √900; −3√0,49 + 2,6; (√4)² − 1,5; 7·(√(2/7))²; √(7² + 33); √(4·5² − 6²).

Question

Вопрос:

Accepted Answer

\(\sqrt{25}-\sqrt{49}=5-7=-2\).
\(\sqrt{64}:\sqrt{900}=8:30=\frac{4}{15}\).
\(-3\sqrt{0{,}49}+2{,}6=-3\cdot0{,}7+2{,}6=-2{,}1+2{,}6=0{,}5\).
\((\sqrt{4})^2-1{,}5=4-1{,}5=2{,}5\).
\(7\cdot\left(\sqrt{\frac{2}{7}}\right)^2=7\cdot\frac{2}{7}=2\).
\(\sqrt{7^2+33}=\sqrt{49+33}=\sqrt{82}\).
\(\sqrt{4\cdot5^2-6^2}=\sqrt{4\cdot25-36}=\sqrt{64}=8\).

Ответ: −2; 4/15; 0,5; 2,5; 2; √82; 8.