Bài 2:
a: \(\dfrac{-12}{24}=\dfrac{-1}{2}\)
b: \(\dfrac{3\cdot5\cdot11}{9\cdot25}=\dfrac{15\cdot11}{225}=\dfrac{11}{15}\)
c: \(\dfrac{25\cdot13}{26\cdot35}=\dfrac{1}{2}\cdot\dfrac{5}{7}=\dfrac{5}{14}\)
d: \(=\dfrac{54-34}{189-119}=\dfrac{20}{70}=\dfrac{2}{7}\)
