141. જો 7 સફરજન, 12 કેળાં અને 17 નારંગીની ખરીદ કિંમત રૂા. 219 અને 3 સફરજન, 5 કેળાં અને 7 નારંગીની ખરીદ કિંમત રૂ1 91 હોય; તો 1 સફરજન, 1 કેનું અને 1 નારંગીની ખરીદ કિંમત કેટલી થશે? (A) ३ે. 17 (B) રા. 19 (C) 21.21 (D) રૂı. 23

140. Determina il valore di \( h \) affinché il punto \( A(4 h-2 ; 1+h) \) appartenga alla retta di equazion \( x-3 y+2=0 \). 141 Trova il valore di \( k \) affinché lo

1.1. \( \frac{9^{n-1} \cdot 27^{3-2 n}}{81^{2-n}} \) \( 1.2 \sqrt{\frac{15^{x} \cdot 3^{x}}{9^{x+1} \cdot 5^{x-2}}} \) \( 1.3 \quad \frac{3.2^{n}-2^{n-2}}{2^{n+1}} \) \( 1.4 \quad \frac{4^{x+1}-4^{x-1}}{15.4^{-x+1} \cdot 4^{2 x-3}} \) \( 1.5 \quad \frac{5.3^{2 x-2}+3^{2 x}}{3^{2 x}-2.3^{2 x-2}} \)

First Multiple choice questions 1. If the point \( (3, b-1) \) lies on the \( x \)-axis, the \( b= \) (Aswan 24) (a) 3 (b) -3 (f) -1 (d) 1 VI If \( (3-x, x-1) \) lies in the fourth quadrant where \( x \in \mathbb{Z} \), then \( x= \) \( \qquad \) (Ismailia (7) (a) 4 g/ 3 (c) 2 (d) zero 3. If \( (125, \sqrt{y})=\left(x^{3}, 4\right) \), then \( x+y= \) (b) 21 (c) 7 (d) 10 4. If \( (2 a, b)=(3 b, 2) \), then \( \frac{a}{b}= \) \( \qquad \) (Luxor 24) (1) \( \frac{3}{2} \) \( 4 \frac{2}{3} \) (c) \( \frac{1}{2} \) (d) 2 If If \( \mathrm{n}(\mathrm{X})=2, \mathrm{n}(\mathrm{X} \times \mathrm{Y})=6 \), then \( \mathrm{n}\left(\mathrm{Y}^{2}\right)= \) (Giza 23) (a) 4 (1) 9 (c) 16 93. If \( X=\{3\} \), then \( X^{2}= \) \( \qquad \) (El-Shurkia 17) (a) 9 (b) \( (3,3) \) (c) \( \{9\} \) If \( X=\{1,2\}, Y=\{3,4\} \), then \( (3,4) \in \) \( \qquad \) (Qena 23) (a) \( \mathrm{X} \times \mathrm{Y} \) (b) \( \mathrm{Y} \times \mathrm{X} \) \( C \times x^{2} \) (d) \( \mathrm{Y}^{2} \) 31. If \( \mathrm{X} \times \mathrm{Y}=\{(2,3)\} \), then \( \mathrm{X}^{2}= \) (E1-Sharkia 18) (a) \( \{(4,9)\} \) (b) \( \{(4,3)\} \) (c) \( \{(2,2)\} \) (d) \( \{(2,9)\} \) (9). If \( f(x)=4 x+b, f(3)=15 \), then \( b= \) \( \qquad \) (E1-Kalyoubia 18) (a) 156 (b) 3 (c) 4 (d) -3 [10. If \( f \) : \( f(x)=n x^{2}+2 x^{n}-3 \), then the set of possible values of \( n \) that make \( f \) a function of the second degree is \( \qquad \) (El-Dakahlia 16) (a) \( \{2,3\} \) (b) \( \{1,-1\} \) (c) \( \{2,1,0\} \) (d) \( \{2,1\} \) \( 131 f: f(x)=5 \) is represented by a straight line parallel to the \( x \)-axis and passing through the point \( \qquad \) (Isnailia 16) (a) \( (0,5) \) (b) \( (5,0) \) (c) \( (5,-5) \) (d) \( (0,0) \)

\[ \text { Fiche: Puissances } \] Tous ces exercices sont extraits de sujets de brevet Exercice 1: Effectuer le calcul suivant et donner le résultat sous forme de fraction irréductible \[ C=\left(\frac{5}{7}\right)^{2}-\frac{2}{7} \]

\( \begin{array}{ll}\text { 2.1 } & x y-5 x y^{2}+10 x^{3} y^{3} \\ \text { 2.2. } & m(r+8)-p(r+8) \\ \text { 2.3 } & r(t-2)-5(2-t) \\ 2.4 & k^{2}(3 x+4)+(-4-3 x)\end{array} \)