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

Toán Lớp 8: timf x a,|2x-1|+1=4 b,|x+3/4|=1/2

Toán Lớp 8: timf x
a,|2x-1|+1=4
b,|x+3/4|=1/2

Comments ( 2 )

  1. a)|2x-1|+1=4
    <=>|2x-1|=3
    <=>$\left[\begin{matrix} 2x-1=3\\ 2x-1=-3\end{matrix}\right.$
    <=>$\left[\begin{matrix} 2x=4\\ 2x=-2\end{matrix}\right.$
    <=>$\left[\begin{matrix} x=2\\ x=-1\end{matrix}\right.$
    Vậy S={2;-1}
    b)|x+3/4}=1/2
    <=>$\left[\begin{matrix} x+\dfrac{3}{4}=\dfrac{1}{2}\\ x+\dfrac{3}{4}=-\dfrac{1}{2}\end{matrix}\right.$
    <=>$\left[\begin{matrix} x=-\dfrac{1}{4}\\ x=-\dfrac{5}{4}\end{matrix}\right.$
    Vậy S={-1/4;-5/4}
     

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