[Toán 6] Phân số

N

nghgh97

\[\boxed{a\dfrac{b}{c} = \dfrac{{ac + b}}{c}}\]
\[2x + 3\frac{1}{2}x - x = 24\frac{1}{4} \Leftrightarrow \left( {2 + \frac{7}{2} - 1} \right)x = \frac{{97}}{4} \Leftrightarrow \frac{9}{2}x = \frac{{97}}{4} \Leftrightarrow x = \frac{{97}}{4}.\frac{2}{9} = \frac{{97}}{{18}} = 5\frac{7}{{18}}\]
 
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