3. Considere a sequência \( a_{n}=\frac{4}{n(n+2)}, n \geq 1 \). a) Escreva os 7 primeiros termos dessa sequência.

Express the repeating decimal number as a quotient of two integers. \( 4 . \overline{45} \) \( 4 . \overline{45}=\square \) (Simplify your answer. Type an improper fraction.)

\( \begin{array}{ll}\text { a) } 3 \sqrt{12}-5 \sqrt{27}+\sqrt{243}-\frac{1}{5} \sqrt{75} & \text { b) } \sqrt{14+\sqrt{7-\sqrt[4]{81}}}\end{array} \)

Radicales: 1.-Di cuáles de las siguientes raíces son racionales y cuáles irracionales. ¿Por qué?: \[ \begin{array}{lllll}24 & \sqrt[3]{1000} & \sqrt[3]{512} & \sqrt[6]{2048} & \sqrt[5]{2048}\end{array} \]

A. \( \frac{3}{5}+\frac{7}{11}=\frac{\square}{55} \)

W1. Wite a number in the box to make itis correct. \[ \frac{3}{5}<\frac{\square}{100}<0.7 \]