\( \begin{array}{ll}\text { a) } 1101_{2}+101_{2} & \text { ё) } 121_{3} \cdot 12_{3} \\ \text { б) } 1421_{8}+20476_{8} & \text { з) } 322_{5} \cdot 14_{5} \\ \text { в) } 1011001_{2}+1000111_{2} & \text { ж) } 120101_{3}: 102_{3} \\ \text { г) } 1100101_{2}+110111_{2} & \text { к) } 1111010101111_{2}: 1011_{2} \\ \text { д) } 11011_{2} \cdot 1101_{2} & \text { л) } 3240_{5}+4023_{5} \\ \text { е) } 101100101_{2} \cdot 1011_{2} & \text { м) } 232658-4762_{8}\end{array} \)

Ex. 3 Simplify \( \left(9.6 \times 3.6 \div 7.2+10.8\right. \) of \( \left.\frac{1}{18}-\frac{1}{10}\right) \)

Aşağıdaki sayıların 9 ile bölünebilmesi için gelebilecek rakamların tamamını yazınız. 7. \( 10 \square 27 \rightarrow \) 8. \( 657 \square \rightarrow \) 9. \( 555555 \square \rightarrow \ldots \)

Ejercicio 2: Cinco carpinteros necesitan 21 días para entarimar un suelo. ¿Cuántos carpinteros seran necesarios si se desea hacer el trabajo en 15 dias?

11. If the average (arithmetic mean) of five numbers is 4 and if four of the numbers are \( 1,3,5 \), and 7 , what is the fifth number? \( \begin{array}{llll}\text { (A) }-1 & \text { (B) } 0 & \text { (C) } & \text { (D) } 6\end{array} \) (E) 9 \( \$ \begin{array}{l}\text { (D) }\end{array} \)

What is 100 degrees Celsius equal to in Fahrenheit?