Question

  Giải hộ

Answer 1

\(a,\dfrac{-14}{15}+\dfrac{-4}{20}=-\dfrac{14}{15}-\dfrac{4}{20}=\dfrac{-14.4}{15.4}-\dfrac{4.3}{20.3}=-\dfrac{56}{60}-\dfrac{12}{60}=\dfrac{-56-12}{60}=-\dfrac{68}{60}=-\dfrac{17}{15}\)

\(b,1,5-\dfrac{3}{4}=\dfrac{3}{2}-\dfrac{3}{4}=\dfrac{3.2}{2.2}-\dfrac{3}{4}=\dfrac{6}{4}-\dfrac{3}{4}=\dfrac{6-3}{4}=\dfrac{3}{4}\)