Question

Tính hợp lý
 7/18 .(-12/23 - 4/15) + 7/18 . (8/30 + 35/23)

Answer 1

hông bé ưi

Answer 2

\(=\dfrac{7}{18}.\dfrac{-12}{23}-\dfrac{7}{18}.\dfrac{4}{5}+\dfrac{7}{18}.\dfrac{8}{30}+\dfrac{7}{18}.\dfrac{35}{23}\)

\(=\dfrac{7}{18}.\left(\dfrac{-12}{23}+\dfrac{35}{23}\right)+\dfrac{7}{18}.\left(\dfrac{4}{5}-\dfrac{8}{30}\right)\)

\(=\dfrac{7}{18}.1+\dfrac{7}{18}.\dfrac{8}{15}\)

\(=\dfrac{7}{18}+\dfrac{28}{135}\)

\(=\dfrac{161}{270}\)