Question

Mọi người giúp mình với

Answer 1

\(d,=\dfrac{3}{7}\left(-\dfrac{3}{4}+\dfrac{2}{5}+\dfrac{3}{5}-\dfrac{1}{4}\right)=\dfrac{3}{7}\left(-1+1\right)=0\\ e,=\dfrac{7}{20}-\dfrac{1}{4}\cdot\dfrac{16}{9}-\dfrac{6}{5}=\dfrac{7}{20}-\dfrac{4}{9}-\dfrac{6}{5}=-\dfrac{233}{180}\\ f,=\dfrac{4}{9}\cdot\dfrac{21}{13}-\dfrac{4}{9}+\dfrac{18}{13}\cdot1=\dfrac{4}{9}\left(\dfrac{21}{13}-1\right)+\dfrac{18}{13}=\dfrac{4}{9}\cdot\dfrac{18}{13}+\dfrac{18}{13}=\dfrac{18}{13}\left(\dfrac{4}{9}+1\right)=\dfrac{18}{13}\cdot\dfrac{13}{9}=2\)