a) -3x=-5+29 b) |x| -9 = -2 +17 c) |x-9|= -2 =17

Question

a) -3x=-5+29 b) |x| -9 = -2 +17 c) |x-9|= -2 =17

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aihong 3 tuần 2021-07-07T14:17:35+00:00 2 Answers 3 views 0

Answers ( )

    0
    2021-07-07T14:19:03+00:00

    a) -3x=-5+29

        -3x=24

           x=24:(-3)

           x=-8

     Vậy x=-8

    b) |x| -9 = -2 +17

         |x|-9 =15

       |x|       =15+9

          |x|    =24

    ⇒x∈{±24}

    Vậy x∈{±24}

    c) |x-9|= -2 +17

        |x-9|=15

      ⇒  x-9∈{±15}

    ⇒x∈{-6 ; 24}

    Vậy x∈∈{-6;24}

    0
    2021-07-07T14:19:08+00:00

    a) -3x = -5 + 29

    ⇒ -3x = 24

    ⇒    x = 24 : (-3) = -8

    Vậy x = -8

    b) |x| – 9 = -2

    ⇒ |x|      = -2 + 9 = 7

    ⇒ \(\left[ \begin{array}{l}x=7\\x=-7\end{array} \right.\) 

    Vậy x ∈ {7; -7}

    c) |x – 9| = -2 + 17

    ⇒ |x – 9| = 15

    ⇒ \(\left[ \begin{array}{l}x-9=15\\x-9=-15\end{array} \right.\) 

    ⇒ \(\left[ \begin{array}{l}x=15+9\\x=-15+9\end{array} \right.\) 

    ⇒ \(\left[ \begin{array}{l}x=24\\x=-6\end{array} \right.\) 

    Vậy x ∈ {24; -6}

     

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