Bai1tim X băngN biet a,(158-X)÷7=20 B,10+2x=4ngu5÷4ngu3

Question

Bai1tim X băngN biet
a,(158-X)÷7=20
B,10+2x=4ngu5÷4ngu3

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Athena 3 tuần 2021-11-21T19:02:58+00:00 2 Answers 5 views 0

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    0
    2021-11-21T19:04:21+00:00

    Đáp án:

    a) $x=18$

    b) $x=3$

    Giải thích các bước giải:

    a) $(158-x):7=20$
    $\Leftrightarrow 158-x=20.7$
    $\Leftrightarrow 158-x=140$
    $\Leftrightarrow x=18$
    Vậy $x=18$
    b) $10+2x=4^{5}:4^{3}$
    $\Leftrightarrow 10+2x=4^{2}$
    $\Leftrightarrow 10+2x=16$
    $\Leftrightarrow 2x=16-10$
    $\Leftrightarrow 2x=6$
    $\Leftrightarrow x=3$
    Vậy $x=3$

    0
    2021-11-21T19:04:38+00:00

    Đáp án: \(\left[ \begin{array}{l}x=18\\x=3\end{array} \right.\) 

    Giải thích:

    $a)(158-x):7=20$

    $158-x=20.7$

    $x=158-140$

    $x=18$

    $b)10+2x=4^5:4^3$

    $10+2x=4^2$

    $2x=16-10$

    $x=6:2$

    $x=3$

     

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