Question

alguem consegue responder o 8º e o 7º

Answer 1

Olá!

7-
a)
$(10 \sqrt{27} + 10\sqrt{3} ) \div 10 \times \sqrt{3} \\(30 \sqrt{3} + 10 \sqrt{3} ) \div 10 \times \sqrt{ 3} \\ 40 \sqrt{3} \div 10 \times \sqrt{3}$
$40 \times 3 \div 10 \\ 12$

b)
$(20 \sqrt{10} + 10 \sqrt{18} ) \div 2 \times \sqrt{2} \\ (20 \sqrt{10} + 30 \sqrt{2} ) \div 2 \times \sqrt{2}$
$\frac{20 \sqrt{10} + 30 \sqrt{2} }{2} \times \sqrt{2 }$
$\frac{2(10 \sqrt{10} + 15 \sqrt{2}) }{2} \times \sqrt{2}$
$(10 \sqrt{10} + 15 \sqrt{2} ) \sqrt{2} \\ 10 \sqrt{20} + 30 \\ 20\sqrt{5} + 30$

8-
a)
$\sqrt[6]{8} \sqrt[3]{2} \\ \sqrt[6]{8} \sqrt[6]{ {2}^{2} } \\ \sqrt[6]{8 \times {2}^{2} }$
$\sqrt[6]{8 \times 4} \\ \sqrt[6]{32}$

b)
$\sqrt[3]{3} \div \sqrt[4]{3} \\ \sqrt[12]{ {3}^{4} } \div \sqrt[12]{ {3}^{3} } \\ \sqrt[12]{3}$

Bons estudos...