pt mũ

H

hthtb22

Gợi ý

Đặt $3^x=a$

Phương trình trở thành

$\dfrac{5}{3}a^2-\dfrac{7}{3}a+\sqrt{1-6a+9a^2}=0$

$\Leftrightarrow \dfrac{5}{3}a^2-\dfrac{7}{3}a+|3a-1|=0$


 
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