¿Cuántas permutaciones de 2 cifras se forman con los números 1,2 y 3 ?

7- The expression \( \left(6 x^{2}\right)\left(3 x^{7}\right) \) is equivalent to \( b x^{9} \), where \( b \) is a constant. What is the value of \( b \) ?

Rani bought 9.7 kg of four. After she used 4.18 kg of it to bake a cake and packed some four equally into 8 packets, she had 1 kg of flour left. How much flour was there in each packet? Round your answer to 2 decimal places.

1) \( \left(3 \frac{1}{4}+0,2,5-1 \frac{5}{4}\right):\left(2 \frac{1}{4}-4 \frac{1}{2}\right. \). \( -0,75):\left(-4 \frac{1}{2}\right)=\frac{1}{3} \) 1)

Résoudre dans \( \mathbb{C} \) les systèmes suivants. \( \begin{array}{l}\text { 1. }\left\{\begin{array}{l}z+z^{\prime}=1+4 i \\ z-z^{\prime}=1-2 i\end{array}\right. \\ \text { 2. }\left\{\begin{array}{l}2 z+3 z^{\prime}=15+7 i \\ z-z^{\prime}=-2+i\end{array}\right.\end{array} \)

Un sac contient 5 boules rouges et 3 boules bleues. On tire au hasard une boule du sac. Quelle est la probabilité de tirer une boule rouge ? Donner la réponse sous forme décimale Réponse