Question

ajutor la mate ex 2,3,5,6

Answer 1

Ex.2
$3^{2x}* 3^{-1} = 3^{5}* 3^{-x} \\ \\ \\ \frac{ 3^{2x} }{3} = \frac{3^{5} }{ 3^{x}} \\ \\ 3^{2x} * 3^{x}= 3^{5}*3 \\ 3^{3x} = 3^{6} \\ 3x=6 \\ x=2$
Ex3. x=y
5x+1=x⇒4x=-1⇒x=$\frac{-1}{4}$ deci si y=$\frac{-1}{4}$
Ex5.
Se splica formula ariei
$A= \frac{AB*AC*sin 60}{2}$
$A= \frac{2 \sqrt{3}* \sqrt{6}* \frac{ \sqrt{ \sqrt{3} } }{2} }{2}$
Dupa simplificari
A=$\frac{3 \sqrt{6} }{2}$

Ex.6
Se aplica formula ariei de la punctul 5
$20= \frac{6*10*sinA}{2} \\ 20=30sinA \\ sinA= \frac{2}{3}$