a: \(A=\dfrac{-35}{63}=\dfrac{-5}{9}\)
\(B=-\dfrac{15}{54}=\dfrac{-5}{18}\)
mà 9<18
nên A<B
b: \(C=\dfrac{2\cdot4+3}{12}\cdot\dfrac{3}{5}=\dfrac{11}{12}\cdot\dfrac{3}{5}=\dfrac{33}{60}=\dfrac{11}{20}\)
\(D=\dfrac{5-8}{20}\cdot\dfrac{-11}{3}=\dfrac{-3}{20}\cdot\dfrac{-11}{3}=\dfrac{11}{20}\)
Do đó: C=D