Question

-13/4 x 3/7 - 13/4 x 10/7 - 13/7

Answer 1

\(\dfrac{-13}{4}.\dfrac{3}{7}-\dfrac{13}{4}.\dfrac{10}{7}-\dfrac{13}{7}\)

\(=\dfrac{13}{4}.\dfrac{-3}{7}-\dfrac{13}{4}.\dfrac{10}{7}-\dfrac{13}{7}\)

\(=\dfrac{13}{4}.\left(\dfrac{-3}{7}-\dfrac{10}{7}\right)-\dfrac{13}{7}\)

\(=\dfrac{13}{4}.\dfrac{-13}{7}-\dfrac{13}{7}\)

\(=\dfrac{-13}{4}.\dfrac{13}{7}-\dfrac{13}{7}\)

\(=\dfrac{13}{7}.\left(\dfrac{-13}{4}-1\right)\)

\(=\dfrac{13}{7}.-\dfrac{17}{4}\)

\(=-\dfrac{221}{28}\)

Answer 2

* Cách làm nhanh: Với biểu thức như trên, hai phân số nhân với nhau có thể đổi dấu cho nhau.*

Answer 3

-13/4 . 3/7 - 13/4 . 10/7 - 13/7

= -13/4 . (3/7 + 10/7) - 13/7

= -13/4 . 13/7 - 13/7

= 13/7 . (-13/4 - 1)

= 13/7 . (-17/4)

= -221/28

Answer 4

Cảm ơn bẹn

Answer 5

- \(\dfrac{13}{4}\)x \(\dfrac{3}{7}\) - \(\dfrac{13}{4}\) x \(\dfrac{10}{7}\) - \(\dfrac{13}{7}\)

= - \(\dfrac{13}{7}\) x \(\dfrac{3}{4}\) - \(\dfrac{13}{7}\)x \(\dfrac{10}{4}\) - \(\dfrac{13}{7}\) x 1

= - \(\dfrac{13}{7}\) x (\(\dfrac{3}{4}\) + \(\dfrac{10}{4}\) + 1)

= - \(\dfrac{13}{7}\) x ( \(\dfrac{17}{4}\))

= - \(\dfrac{221}{28}\)