Tính nhanh : -5/9 x -6/13 + 5/-9 x -5/13 – 5/9

Question

Tính nhanh : -5/9 x -6/13 + 5/-9 x -5/13 – 5/9

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Athena 2 tháng 2021-10-06T08:37:18+00:00 2 Answers 5 views 0

Answers ( )

    0
    2021-10-06T08:38:21+00:00

    Đáp án:

     $\dfrac{-5}{9} . \dfrac{-6}{13} + \dfrac{5}{-9} . \dfrac{-5}{13} – \dfrac{5}{9}$

    $ = \dfrac{-5}{9} .(  \dfrac{-6}{13} + \dfrac{-5}{13} +1 )$

    $ = \dfrac{-5}{9} . \dfrac{2}{13}$

    $ = \dfrac{-10}{117}$

    0
    2021-10-06T08:39:14+00:00

    $\frac{-5}{9} . \frac{-6}{13} + \frac{5}{-9} . \frac{-5}{13} – \frac{5}{9}$

    = $\frac{-5}{9} . \frac{-6}{13} + \frac{-5}{9} . \frac{-5}{13} + \frac{-5}{9} . 1$

    = $\frac{-5}{9} . (\frac{-6}{13} + \frac{-5}{13} + 1)$

    = $\frac{-5}{9} . 0$

    = $0$

    Cho mk câu trả lời hay nhất nhé bạn

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