Question

-5/7×2/11+-5/7×9/11+5/7

Answer 1

Ta có: \(\dfrac{-5}{7}\cdot\dfrac{2}{11}+\dfrac{-5}{7}\cdot\dfrac{9}{11}+\dfrac{5}{7}\)

\(=\dfrac{-5}{7}\cdot\left(\dfrac{2}{11}+\dfrac{9}{11}-1\right)\)

\(=\dfrac{-5}{7}\cdot0=0\)

Answer 2

\(\dfrac{-5}{7}.\dfrac{2}{11}+\dfrac{-5}{7}.\dfrac{9}{11}+\dfrac{5}{7}=\dfrac{-5}{7}.\left(\dfrac{2}{11}+\dfrac{9}{11}\right)+\dfrac{5}{7}=\dfrac{-5}{7}.1+\dfrac{-5}{7}=\dfrac{-5}{7}+\dfrac{5}{7}=0\)