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

Toán Lớp 7: Tìm x E Q biết: /3x-5/-2.5=1/4

Home/ Toán Lớp 7: Tìm x E Q biết: /3x-5/-2.5=1/4

Toán Lớp 7: Tìm x E Q biết: /3x-5/-2.5=1/4

Tháng Mười Hai 24, 2022 Toán học 2 Comments 0 views

Toán Lớp 7: Tìm x E Q biết:
/3x-5/-2.5=1/4

Comments ( 2 )

  1. mocmien87
    mocmien87
    24 Tháng Mười Hai, 2022 at 7:17 sáng
    Reply
    |3x-5|-2,5=1/4
    |3x-5|-20/5=1/4
    =>|3x-5|-5/2=1/4
    =>|3x-5|=1/4+5/2
    =>|3x-5|=11/4
    $\Rightarrow\left[\begin{matrix} 3x-5=\dfrac{11}{4}\\ 3x-5=\dfrac{-11}{4}\end{matrix}\right.$
    $\Rightarrow\left[\begin{matrix} 3x=\dfrac{31}{4}\\ 3x=\dfrac{9}{4}\end{matrix}\right.$
    $\Rightarrow\left[\begin{matrix} x=\dfrac{31}{12}\\ x=\dfrac{3}{4}\end{matrix}\right.$
    Vậy x=31/12 hoặc x=3/4

  2. maitrucloan
    maitrucloan
    24 Tháng Mười Hai, 2022 at 7:16 sáng
    Reply
    \qquad |3x-5|-2,5=1/4
    <=> |3x-5|-5/2=1/4
    <=> |3x-5|=1/4+5/2
    <=> |3x-5|=11/4
    <=>\(\left[ \begin{array}{l}3x-5=\dfrac{11}{4}\\3x-5=\dfrac{-11}{4}\end{array} \right.\) 
    <=>\(\left[ \begin{array}{l}3x=\dfrac{31}{4}\\3x=\dfrac{9}{4}\end{array} \right.\) 
    <=>\(\left[ \begin{array}{l}x=\dfrac{31}{12}\\x=\dfrac{3}{4}\end{array} \right.\) 
    Vậy x∈{31/12;3/4}

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

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