2 phép nữa a) -2/7 . 21/8 b) z.24 . (-15/4)

Question

2 phép nữa
a) -2/7 . 21/8
b) z.24 . (-15/4)

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Remi 3 tuần 2021-07-12T12:28:31+00:00 2 Answers 2 views 0

Answers ( )

    0
    2021-07-12T12:29:55+00:00

    a) $-\dfrac{2}{7}.\dfrac{21}{8}$

    `=-(2/7 . 21/8)`

    `=-(1 . 3/4)`

    `=-3/4`

    b) `z.24.(-15/4)`

    `=z.6.(-15)`

    `=-90z`

    0
    2021-07-12T12:30:17+00:00

    Đáp án:

    $a)$ $\dfrac{-3}{4}$
    $b)$ $\dfrac{-9}{10}$

    Giải thích các bước giải:
    $a)$ $\dfrac{-2}{7}$ $.$ $\dfrac{21}{8}$
           $=$ $\dfrac{-3}{4}$
    $b)$ $z.24$ $.$ $\dfrac{-15}{4}$
           $⇒$ $z$ $.$ $($ $24$ $.$ $\dfrac{-15}{4}$ $)$
           $⇒$ $z$ $.$ $-90$
           $⇒$ $-90z$

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