phương trình mũ logarit

D

dien0709

2) $3^x.8^{\frac{x}{x+2}}=6$

$\leftrightarrow xln3+\dfrac{x}{x+2}ln8=ln6$

$\leftrightarrow (x+2)xln3+3xln2-(x+2)ln3-(x+2)ln2=0$

$\leftrightarrow 2ln2(x-1)+(x-1)(x+2)ln3=0$

$\leftrightarrow x=1$ hoặc $x=-2-2\dfrac{ln2}{ln3}$
 
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