Giải phương trình : $\frac{x}{3}$ - $\frac{5x}{6}$ - $\frac{15x}{12}$ - $\frac{x}{4}$ - 5
2 câu trả lời
#andy
\[\begin{array}{l}
\dfrac{x}{3} - \dfrac{{5x}}{6} - \dfrac{{15x}}{{12}} - \dfrac{x}{4} - 5\\
MC:12\\
= \dfrac{{x.4}}{{3.4}} - \dfrac{{5x.2}}{{6.2}} - \dfrac{{15x}}{{12}} - \dfrac{{3.x}}{{4.3}} - 5\\
= \dfrac{{4x}}{{12}} - \dfrac{{10x}}{{12}} - \dfrac{{15x}}{{12}} - \dfrac{{3x}}{{12}} - 5\\
= \dfrac{{4x - 10x - 15x - 3x}}{{12}}\\
= \dfrac{{ - 24x}}{{12}} - 5\\
= - 2x - 5
\end{array}\]