tách ra đi bạn chứ để thế có thể ko ai trả lời cho bạn đâu
a. \(\dfrac{3}{5}+\dfrac{2}{5}:\dfrac{1}{5}\) = \(\dfrac{3}{5}+2=\dfrac{13}{5}\)
b. \(\dfrac{7}{5}-\dfrac{2}{5}.\dfrac{5}{4}=\dfrac{7}{5}-\dfrac{1}{2}=\dfrac{9}{10}\)
d. \(\dfrac{7}{9}-\left(\dfrac{5}{4}+\dfrac{7}{9}\right)+\dfrac{1}{2}=\dfrac{7}{9}-\dfrac{73}{36}+\dfrac{1}{2}=\dfrac{-3}{4}\)
e. \(\dfrac{-7}{25}+\dfrac{-18}{25}+\dfrac{4}{3}+\dfrac{5}{7}+\dfrac{19}{23}=-1+\dfrac{4}{3}+\dfrac{5}{7}+\dfrac{19}{23}=\dfrac{1}{3}+\dfrac{5}{7}+\dfrac{19}{23}=\dfrac{22}{21}+\dfrac{19}{23}=\dfrac{905}{483}\)
f. \(0,75-\dfrac{43}{80}:\left(\dfrac{-4}{5}+2,5.\dfrac{3}{4}\right)=0,75-\dfrac{43}{80}:\left(\dfrac{-4}{5}+\dfrac{15}{8}\right)=\) \(0,75-\dfrac{43}{80}:\dfrac{43}{40}=0,75-\dfrac{1}{2}=\dfrac{1}{4}\)
g: \(=\dfrac{-7}{11}\left(\dfrac{11}{19}+\dfrac{8}{19}\right)-\dfrac{4}{11}=\dfrac{7}{11}-\dfrac{4}{11}=-1\)
h: \(=\dfrac{-3}{4}-\dfrac{1}{4}+\dfrac{2}{7}+\dfrac{5}{7}+\dfrac{3}{5}=\dfrac{3}{5}\)
i: \(=\dfrac{2}{7}+\dfrac{5}{7}+\dfrac{3}{11}-\dfrac{6}{11}+\dfrac{1}{4}=\dfrac{5}{4}-\dfrac{3}{11}=\dfrac{43}{44}\)
k: =9/17-1=-8/17
m: =-5/7+1+5/7=1
