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

Toán Lớp 7: tìm x ∈ Q biết a , | x + 0,25 | – 4 = 1/4

Toán Lớp 7: tìm x ∈ Q biết
a , | x + 0,25 | – 4 = 1/4

Comments ( 2 )

  1. $|x^{}+0,25|-4=$ $\dfrac{1}{4}$
    ⇔ $|x^{}+\dfrac{1}{4}|=$ $\dfrac{17}{4}$ 
    ⇔ \(\left[ \begin{array}{l}x+\dfrac{1}{4}=\dfrac{17}{4}\\x+\dfrac{1}{4}=-\dfrac{17}{4}\end{array} \right.\) 
    ⇔ \(\left[ \begin{array}{l}x=4\\x=\dfrac{-9}{2}\end{array} \right.\) 
    Chúc bạn học tốt !!!!!

  2. $| x + 0,25 | – 4 =$ $\dfrac{1}{4}$
    $\Leftrightarrow$ $| x + 0,25 | =$ $\dfrac{17}{4}$
    $\Leftrightarrow$ $\left[\begin{matrix} x+0,25=\dfrac{17}{4}\\ x+0,25=\dfrac{-17}{4}\end{matrix}\right.$
    $\Leftrightarrow$ $\left[\begin{matrix} x=4\\ x=\dfrac{-9}{2}\end{matrix}\right.$
    Vậy $x=4, x=\dfrac{-9}{2}$

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