Bài 10:
a: =6/23-6/23+5/9=5/9
b: \(=\dfrac{1}{7}-1=-\dfrac{6}{7}\)
c: \(=\dfrac{-2}{9}+\dfrac{14}{33}+\dfrac{19}{33}=1-\dfrac{2}{9}=\dfrac{7}{9}\)
d: \(=\dfrac{-5}{9}-\dfrac{4}{9}+\dfrac{17}{13}+\dfrac{9}{13}-\dfrac{5}{4}=-1+2-\dfrac{5}{4}=1-\dfrac{5}{4}=-\dfrac{1}{4}\)