Exercice 1 1) Compléter avec l'un des symboles : \( \epsilon ; \notin ; \subset \) ou \( \notin \) \( \{0 ;-7 ; 12\} \ldots \ldots \mathbb{N}^{*} ; \frac{5 \pi-\pi}{2 \pi-\pi} \ldots . \mathbb{Q} ;\left\{-1 ; \frac{18}{6} ; \sqrt{36} ;-7\right\} \ldots . \mathbb{Z} ; \frac{7}{3} \ldots \ldots \) ID 2) donner l'écriture scientifique : \( A=\frac{4 \times 300^{2} \times\left(2 \times 10^{-6}\right)^{-2}}{(0.01)^{-3}} \)

\[ S_{n}=-6+2+10+18+\ldots \] to \( n \) terms. 1. We can find an expression for the general term of the series in the form \( T_{k}=b k+c \). What are the values of \( b \) and \( c \) ? Answer: 1. \( b= \)

Given: \( \sum_{n=3}^{5} b \cdot 1^{n+1}=54 \) Calculate the value of \( b \)

\( 67.04 cm ^ { 2 } = \frac { \sqrt { 26 a } } { 2 } h \)

20 If \( \frac{a}{b}=\frac{c}{d}=\frac{3}{5} \), then \( \frac{a+c}{b+d}=\ldots \ldots \ldots \ldots \) \( \begin{array}{llll}\text { (a) } \frac{5}{3} & \text { (b) } \frac{3}{5} & \text { (c) } \frac{6}{5} & \text { (d) } \frac{5}{6}\end{array} \)

\( \left\{ \left. \begin{array} { l } { a - 5 < 2 a + 3 } \\ { 3 a - 2 < a - 6 } \end{array} \right. \Rightarrow a \in ? \right. \)