Đáp án:

Giải thích các bước giải:

$\left (\dfrac{-7}{31}+\dfrac{24}{19} \right )+\dfrac{1}{15}-\left (\dfrac{5}{19}-\dfrac{7}{31} \right )$

$=\dfrac{-7}{31}+\dfrac{24}{19}+\dfrac{1}{15}-\dfrac{5}{19}+\dfrac{7}{31}$

$=\left (\dfrac{7}{31}-\dfrac{7}{31} \right )+\left (\dfrac{24}{19}-\dfrac{5}{19} \right )+\dfrac{1}{15}$

$=1+\dfrac{1}{15}$

$=\dfrac{16}{15}$

bn tham khảo nha

($\frac{-7}{31}$ +$\frac{24}{29}$ )+ $\frac{1}{15}$ - ($\frac{5}{19}$ - $\frac{7}{31}$)

= $\frac{-7}{31}$ +$\frac{24}{29}$ + $\frac{1}{15}$ - $\frac{5}{19}$ + $\frac{7}{31}$

= ($\frac{-7}{31}$ + $\frac{7}{31}$) + $\frac{24}{29}$ + $\frac{1}{15}$ - $\frac{5}{19}$

=0 + $\frac{24}{29}$ + $\frac{1}{15}$ - $\frac{5}{19}$

=$\frac{24}{29}$ + $\frac{1}{15}$ - $\frac{5}{19}$

= $\frac{389}{435}$ - $\frac{5}{19}$

=$\frac{5216}{8265}$

chúc bn hc tốt

cho mk xin hay nhất nha