Question

Giúp e vs huhuhu

Answer 1

   \(\dfrac{7}{18}\).(\(\dfrac{-12}{23}\)-\(\dfrac{4}{15}\))+\(\dfrac{7}{18}\).(\(\dfrac{8}{30}\)+\(\dfrac{35}{23}\))

= \(\dfrac{7}{18}\).[\(\dfrac{-12}{23}\)-\(\dfrac{4}{15}\)+\(\dfrac{8}{30}\)+\(\dfrac{35}{23}\)]

=  \(\dfrac{7}{18}\).[(\(\dfrac{-12}{23}\)+\(\dfrac{35}{23}\))-(\(\dfrac{4}{15}\)+\(\dfrac{4}{15}\))]

=   \(\dfrac{7}{18}\).[1-\(\dfrac{8}{15}\)]   =    \(\dfrac{7}{18}\).\(\dfrac{7}{15}\)    =      \(\dfrac{49}{270}\)

Answer 2

\(\dfrac{7}{18}.\left(\dfrac{-12}{23}-\dfrac{4}{15}\right)+\dfrac{7}{18}.\left(\dfrac{8}{30}+\dfrac{35}{23}\right)\) 

\(=\dfrac{7}{18}.\left(\dfrac{-12}{23}-\dfrac{4}{15}+\dfrac{8}{30}+\dfrac{35}{23}\right)\) 

\(=\dfrac{7}{18}.\left[\left(\dfrac{-12}{23}+\dfrac{35}{23}\right)+\left(\dfrac{-4}{15}+\dfrac{8}{30}\right)\right]\) 

\(=\dfrac{7}{18}.\left[1+0\right]\) 

\(=\dfrac{7}{18}.1\) 

\(=\dfrac{7}{18}\)