2 câu trả lời
Đáp án:
$\dfrac{-7}{12}+\dfrac{-2}{8}$
$= \dfrac{-14}{24}+\dfrac{-6}{24}$
$= \dfrac{(-14)+(-6)}{24}$
$= \dfrac{-20}{24}$
$= \dfrac{-5}{6}$
`(-7)/12 + (-2)/8`
`= (-7.2)/(12.2) + (-2.3)/(8.3)`
`= (-14)/24 + (-6)/24`
`= (-14+(-6))/24`
`= (-20)/24`
`= (-20:4)/(24:4)`
`= (-5)/6`