Bài 4
\(a,=\dfrac{34}{5}-\left(\dfrac{5}{3}+\dfrac{19}{5}\right)\\ =\dfrac{34}{5}-\left(\dfrac{25+19.3}{15}\right)\\ =\dfrac{34}{5}-\dfrac{82}{15}\\ =\dfrac{34.3-82}{15}\\ =\dfrac{4}{3}\\ b,=\dfrac{82}{11}-\left(\dfrac{17}{7}+\dfrac{38}{11}\right)\\ =\dfrac{82}{11}-\dfrac{17}{7}-\dfrac{38}{11}\\ =4-\dfrac{17}{7}\\ =\dfrac{4.7-17}{7}\\ =\dfrac{11}{7}\\ c,=\dfrac{68}{9}-\left(\dfrac{11}{4}+\dfrac{32}{9}\right)\\ =\dfrac{68}{9}-\dfrac{32}{9}-\dfrac{11}{4}\\ =4-\dfrac{11}{4}\\ =\dfrac{16-11}{4}=\dfrac{5}{4}\\ d,=\dfrac{54}{7}-\left(\dfrac{7}{4}+\dfrac{19}{7}\right)\\ =\dfrac{54}{7}-\dfrac{7}{4}-\dfrac{19}{7}\\ =5-\dfrac{7}{4}\\ =\dfrac{20-7}{4}\\ =\dfrac{13}{4}\)
