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

Toán Lớp 7: Tìm x /x + 3/4 / – 1/2 = 0 /x/ = 3 và 1/4 /x/ = 1,357

Toán Lớp 7: Tìm x
/x + 3/4 / – 1/2 = 0
/x/ = 3 và 1/4
/x/ = 1,357

Comments ( 2 )

  1. |x+ 3/4|-1/2=0
    |x + 3/4|=1/2
    TH1: x+3/4 =1/2
           x=1/2 – 3/4
           x=2/4 – 3/4
           x=1/4
    TH2: x +3/4=-1/2
           x=-1/2 – 3/4
           x=-2/4-3/4
           x=-5/4
    b)|x|=3 1/4
    TH1: x=3 1/4
    TH2: x=-3 1/4
    c)|x|=1,357
    TH1:x=1,357
    TH2:x=-1,357

  2. Giải đáp+Lời giải và giải thích chi tiết:
    •)|x+3/4| -1/2=0
    =>|x+3/4|=1/2
    =>\(\left[ \begin{array}{l}x+3/4=1/2\\x+3/4=-1/2\end{array} \right.\) 
    =>\(\left[ \begin{array}{l}x=1/2+3/4\\x=-1/2+3/4\end{array} \right.\) 
    =>\(\left[ \begin{array}{l}x=5/4\\x=1/4\end{array} \right.\) 
    Vậy…
    b)|x|=3 1/4
    =>|x|=13/4
    =>\(\left[ \begin{array}{l}x=13/4\\x=-13/4\end{array} \right.\) 
    Vậy….
    c)|x|=1,357
    =>\(\left[ \begin{array}{l}x=1,357\\x=-1,357\end{array} \right.\) 
    Vậy..
     

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

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