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

Toán Lớp 7: 2-I3/2x-1/4I=I-5/4I giúp mik vs

Tháng Mười Hai 16, 2022 Toán học 2 Comments 0 views

Toán Lớp 7: 2-I3/2x-1/4I=I-5/4I
giúp mik vs

Comments ( 2 )

  1. cobelolen
    cobelolen
    16 Tháng Mười Hai, 2022 at 3:58 sáng
    Reply
    2 – |3/2x – 1/4| = |-5/4|
    ⇔ 2 – |3/2x – 1/4| = 5/4
    ⇔ -|3/2x – 1/4| = 5/4 – 2
    ⇔ -|3/2x – 1/4| = 5/4 – 8/4
    ⇔ -|3/2x – 1/4| = -3/4
    ⇔ |3/2x – 1/4| = (-3/4)/(-1)
    ⇔ |3/2x – 1/4| = (-3)/(-4)
    ⇔ |3/2x – 1/4| = 3/4
    ⇔ \(\left[ \begin{array}{l}{ \dfrac{3}{2}}x – { \dfrac{1}{4}} = { \dfrac{3}{4}}\\{ \dfrac{3}{2}}x – { \dfrac{1}{4}} = -{ \dfrac{3}{4}}\end{array} \right.\) 
    ⇔ \(\left[ \begin{array}{l}{ \dfrac{3}{2}}x = 1\\{ \dfrac{3}{2}}x = -{ \dfrac{1}{2}}\end{array} \right.\) 
    ⇔ \(\left[ \begin{array}{l}x={ \dfrac{2}{3}}\\x=-{ \dfrac{1}{3}}\end{array} \right.\) 
    Cho mình xin hay nhất nha bạn!!!!
    @Drew Mclntyre
     

  2. aivilanlan
    aivilanlan
    16 Tháng Mười Hai, 2022 at 3:58 sáng
    Reply
    $2-|\dfrac{3}{2}x-\dfrac{1}{4}|=|\dfrac{-5}{4}|$
    $2-|\dfrac{3}{2}x-\dfrac{1}{4}|=\dfrac{5}{4}$
    $|\dfrac{3}{2}x-\dfrac{1}{4}|=\dfrac{3}{4}$
    $+,\dfrac{3}{2}x-\dfrac{1}{4}=\dfrac{3}{4}$
    $\dfrac{3}{2}x=1$
    $x=\dfrac{2}{3}$
    $+,\dfrac{3}{2}x-\dfrac{1}{4}=\dfrac{-3}{4}$
    $\dfrac{3}{2}x=\dfrac{-1}{2}$
    $x=\dfrac{-1}{3}$
    Vậy x∈{\frac{2}{3};\frac{-1}{3}}

     

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

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