Bài 3:
a: \(\dfrac{7}{15}-\dfrac{6}{25}=\dfrac{35-18}{75}=\dfrac{17}{75}\)
b: \(\dfrac{7}{12}+\dfrac{1}{4}-\dfrac{5}{6}=\dfrac{7+3-10}{12}=0\)
c: \(=\dfrac{27}{60}+\dfrac{35}{60}+\dfrac{44}{60}=\dfrac{106}{60}=\dfrac{53}{30}\)
d: \(=\dfrac{100}{30}+\dfrac{39}{30}+\dfrac{15}{30}-\dfrac{14}{30}=\dfrac{140}{30}=\dfrac{14}{3}\)