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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 7: Tìm x: |x|=12/31 |x|=0 |x|=|-5/7|

Toán Lớp 7: Tìm x: |x|=12/31
|x|=0
|x|=|-5/7|

Comments ( 2 )

  1. |x|=12/31
    =>x=+-12/31
    |x|=0
    =>x=0
    |x|=|-5/7|
    |x|=5/7
    =>x=+-5/7

  2. Answer
    |x| = 12/31
    => $\left[\begin{matrix} x=\dfrac{12}{31}\\ x=\dfrac{-12}{31}\end{matrix}\right.$
    $\text{Vậy}$ x \in {12/31 ; {-12}/31}
    |x| = 0
    => x = 0
    $\text{Vậy}$ x = 0
    |x| = -5/7
    |x| = 5/7
    => $\left[\begin{matrix} x=\dfrac{5}{7}\\ x=\dfrac{-5}{7}\end{matrix}\right.$
    $\text{Vậy}$ x \in {5/7 ; -5/7}
    $\text{Áp dụng:}$
    |x| = +- x
     

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222-9+11+12:2*14+14 = ? ( )

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