5. Вычислите:
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a) $$ \sqrt{25} - \sqrt{49} = 5 - 7 = -2 $$
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б) $$ \sqrt{16} \cdot \sqrt{9} = 4 \cdot 3 = 12 $$
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в) $$ 3\sqrt{4} - \sqrt{36} = 3 \cdot 2 - 6 = 6 - 6 = 0 $$
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г) $$ 64 : \sqrt{900} = 64 : 30 = \frac{64}{30} = \frac{32}{15} $$
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a) $$ \sqrt{0.36} + \sqrt{0.01} = 0.6 + 0.1 = 0.7 $$
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б) $$ \sqrt{0.64} - 1 = 0.8 - 1 = -0.2 $$
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в) $$ -3 \sqrt{0.49} + 2.6 = -3 \cdot 0.7 + 2.6 = -2.1 + 2.6 = 0.5 $$
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г) $$ \sqrt{0.4} - \sqrt{0.04} = \sqrt{0.4} - 0.2 $$
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a) $$ (\sqrt{4})^2 - 1.5 = 4 - 1.5 = 2.5 $$
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б) $$ 7 \cdot (\sqrt{\frac{2}{7}})^2 = 7 \cdot \frac{2}{7} = 2 $$
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в) $$ (\sqrt{0.9})^2 - 0.3 = 0.9 - 0.3 = 0.6 $$
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г) $$ (\sqrt{12})^2 = 12 $$
Ответ: 1) a) -2; б) 12; в) 0; г) 32/15; 2) a) 0.7; б) -0.2; в) 0.5; г) $$\sqrt{0.4} - 0.2$$; 3) a) 2.5; б) 2; в) 0.6; г) 12.