Вычислите: a) $$6 \sqrt{\frac{1}{9}} + 10 \sqrt{1,96}$$; б) $$18 - 4 \sqrt{\frac{1}{64}}$$; в) $$(3 \sqrt{2,5})^2$$

а) $$6 \sqrt{\frac{1}{9}} + 10 \sqrt{1,96}$$ = $$6 \cdot \frac{1}{3} + 10 \cdot 1,4$$ = $$2 + 14$$ = $$16$$

б) $$18 - 4 \sqrt{\frac{1}{64}}$$ = $$18 - 4 \cdot \frac{1}{8}$$ = $$18 - \frac{1}{2}$$ = $$17,5$$

в) $$(3 \sqrt{2,5})^2$$ = $$3^2 \cdot (\sqrt{2,5})^2$$ = $$9 \cdot 2,5$$ = $$22,5$$

Ответ: a) 16; б) 17,5; в) 22,5.