2 câu trả lời
$\frac{15}{6}$ - $\frac{7}{4}$ +2
= $\frac{3}{4}$ +2
= $\frac{11}{4}$
3-( $\frac{13}{8}$ + $\frac{5}{12}$
=3- $\frac{49}{24}$
=$\frac{23}{24}$
$\begin{array}{l} + )\,\,\frac{{15}}{6} - \frac{7}{4} + 2 = \frac{5}{2} - \frac{7}{4} + 2 = \frac{{10}}{4} - \frac{7}{4} + \frac{8}{4} = \frac{3}{4} + \frac{8}{4} = \frac{{11}}{4}\\ + )\,\,3 - \left[ {\frac{{13}}{8} + \frac{5}{{12}}} \right] = 3 - \left[ {\frac{{39}}{{24}} + \frac{{10}}{{24}}} \right] = 3 - \frac{{49}}{{24}}\\ \,\,\,\,\,\, = \frac{{72}}{{24}} - \frac{{49}}{{24}} = \frac{{23}}{{24}} \end{array}$
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