$\dfrac{39}{28}$ $\times$ $\dfrac{56}{47}$
$=$ $\dfrac{2148}{1316}$
$\dfrac{6}{25}$ $\times$ x $\dfrac{-15}{4}$
$=$ $\dfrac{-90}{100}$
$\dfrac{2}{-21}$ $\times$ $\dfrac{-7}{3}$
$=$ $\dfrac{-14-63}$
1 vote + 1 cảm ơn
$\dfrac{-15}{7}$ $\times$ $\dfrac{-14}{25}$
$=$ $\dfrac{210}{175}$
0 $\times$ $\dfrac{39}{28}$
$=$ 0