Question

a) 

b)

Answer 1

mik đang cần gấp

Answer 2

a) \(\dfrac{31}{23}-\left(\dfrac{7}{32}+\dfrac{8}{23}\right)=\dfrac{31}{23}-\dfrac{8}{23}-\dfrac{7}{32}=\dfrac{23}{23}-\dfrac{7}{32}=1-\dfrac{7}{32}=\dfrac{32}{32}-\dfrac{7}{32}=\dfrac{25}{32}\)

b) \(\dfrac{38}{45}-\left(\dfrac{8}{45}-\dfrac{17}{51}-\dfrac{3}{11}\right)=\dfrac{38}{45}-\dfrac{8}{45}+\dfrac{17}{51}++\dfrac{3}{11}=\dfrac{30}{45}+\dfrac{17}{51}+\dfrac{3}{11}\)

\(=\dfrac{5610}{8415}+\dfrac{2805}{8415}+\dfrac{2294}{8415}=\dfrac{10710}{8415}=\dfrac{14}{11}\)

(Cho mình xin 1 đúng ở dưới nhé)