2 câu trả lời
Đáp án:
$\dfrac{1}{3} . \dfrac{-6}{13}. \dfrac{-9}{10}. \dfrac{-1}{30}$
$= (\dfrac{1}{3}.\dfrac{-1}{30}).(\dfrac{-6}{13}.\dfrac{-9}{10})$
$= \dfrac{-1}{90}.\dfrac{27}{65}$
$= \dfrac{-27}{5850}$
$= \dfrac{-3}{650}$
`1/3 xx (-6)/13 xx (-9)/10 xx (-1)/30`
`= (-2)/13 xx (-9)/10 xx (-1)/30`
`= 9/65 xx (-1)/30`
`= (-3)/650`