Question

Giúp mình bài này với mai mình phải nộp r 

Answer 1

\(a,=\left(\dfrac{11}{23}+\dfrac{12}{23}\right)+\left(\dfrac{5}{13}-\dfrac{18}{13}\right)+\dfrac{1}{2}=1-1+\dfrac{1}{2}=\dfrac{1}{2}\\ b,=2\cdot\dfrac{9}{16}+\dfrac{1}{2}=\dfrac{9}{8}+\dfrac{4}{8}=\dfrac{13}{8}\\ c,=\dfrac{1}{3}\left(2\dfrac{5}{8}-11\dfrac{5}{8}\right)=-9\dfrac{5}{8}\cdot\dfrac{1}{3}=-\dfrac{77}{8}\cdot\dfrac{1}{3}=-\dfrac{77}{24}\)