Question

$efetue-as-operacoes-simplificando-quando-possivel: A) \sqrt{2}*(3\sqrt{10} ) = B) 10\sqrt{20} :2 \sqrt{5} =$

Answer 1

a) $\sqrt{2} .(3 \sqrt{10}) = 3 \sqrt{2.10} = 3 \sqrt{20} = 3. \sqrt{2^2.5} = 3.2 \sqrt{5}= 6 \sqrt{5}$

b)$\frac{10 \sqrt{20} }{2 \sqrt{5} } = 5 \sqrt{ \frac{20}{5} } =5 \sqrt{4} = 5.2 = 10$