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

Toán Lớp 7: 2. I 3/4 + 2 I = 4/5 TÌM X LƯU Ý : I LÀ TRỊ TUYỆT ĐỐI NHANH GIÚP MÌNH Ạ THANKSSS

Tháng Mười 4, 2022 Toán học 2 Comments 0 views

Toán Lớp 7: 2. I 3/4 + 2 I = 4/5
TÌM X
LƯU Ý : I LÀ TRỊ TUYỆT ĐỐI
NHANH GIÚP MÌNH Ạ THANKSSS

Comments ( 2 )

  1. mocmien87
    mocmien87
    4 Tháng Mười, 2022 at 4:50 sáng
    Reply
    #Nhung
               |$\frac{3}{4}$+2x|=$\frac{4}{5}$ 
    ⇒\(\left[ \begin{array}{l}3/4+2x=4/5\\3/4+2x=-4/5\end{array} \right.\)  
    ⇒\(\left[ \begin{array}{l}2x=4/5-3/4\\2x=-4/5-3/4\end{array} \right.\) 
    ⇒\(\left[ \begin{array}{l}2x=1/20\\2x=-31/20\end{array} \right.\) 
    ⇒\(\left[ \begin{array}{l}x=1/40\\x=-31/40\end{array} \right.\) 

  2. cobebongdem
    cobebongdem
    4 Tháng Mười, 2022 at 4:50 sáng
    Reply
    Answer
    2 . |3/4 + 2x| = 4/5
    $\Rightarrow$ |3/4 + 2x| = 4/5 : 2
    $\Rightarrow$ |3/4 + 2x| = 2/5
    $\Rightarrow$ $\left[\begin{matrix} \dfrac{3}{4}+2x=\dfrac{2}{5}\\ \dfrac{3}{4}+2x=\dfrac{-2}{5}\end{matrix}\right.$
    $\Rightarrow$ $\left[\begin{matrix} 2x=\dfrac{2}{5}-\dfrac{3}{4}\\ 2x=\dfrac{-2}{5}-\dfrac{3}{4}\end{matrix}\right.$
    $\Rightarrow$ $\left[\begin{matrix} 2x=\dfrac{-7}{20}\\ 2x=\dfrac{-23}{20}\end{matrix}\right.$
    $\Rightarrow$ $\left[\begin{matrix} x=\dfrac{-7}{20}:2\\ x=\dfrac{-23}{20}:2\end{matrix}\right.$
    $\Rightarrow$ $\left[\begin{matrix} x=\dfrac{-7}{40}\\ x=\dfrac{-23}{40}\end{matrix}\right.$
    $\text{Vậy}$ x \in {-7/40 ; -23/40}

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

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