\(\dfrac{-3}{16};\dfrac{-21}{56}\) MSC : 112
\(\dfrac{-3}{16}=\dfrac{\left(-3\right)\cdot7}{16\cdot7}=\dfrac{-21}{112}\)
\(\dfrac{-21}{56}=\dfrac{\left(-21\right)\cdot2}{56\cdot2}=\dfrac{-42}{112}\)
Vậy \(\dfrac{-3}{16};\dfrac{-21}{56}\) quy đồng lên ta được 2 phân số : \(\dfrac{-21}{112};\dfrac{-42}{112}\)