\(5:\dfrac{2}{3}=5\times\dfrac{3}{2}=\dfrac{15}{2}\)

\(\dfrac{18}{24}=\dfrac{27}{36}\)

\(\dfrac{36}{63}=\dfrac{4}{7}\)

vừa lướt face vừa trả lời :>

\(\Leftrightarrow\sin\left(2x-20^o\right)=60^o\)

\(\Leftrightarrow\left[{}\begin{matrix}2x-20^o=60^o+k360^o\\2x=180^o-60^o+k360^o\end{matrix}\right.\)

\(\Leftrightarrow\left[{}\begin{matrix}2x=80^o+k360^o\\2x=140^o+k360^o\end{matrix}\right.\)

\(\Leftrightarrow\left[{}\begin{matrix}x=40^o+k180^o\\x=70^o+k180^o\end{matrix}\right.\left(k\in Z\right)\)