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

Toán Lớp 7: tìm x 2/3 – [3/4 – x ] = √1/9 b, [1/2 – x ]^2 = (-2)^2

Toán Lớp 7: tìm x
2/3 – [3/4 – x ] = √1/9
b, [1/2 – x ]^2 = (-2)^2

Comments ( 2 )

  1. text{Giải đáp + Lời giải và giải thích chi tiết}
    a)
    2/3-[3/4-x]=√1/9
    =>2/3-3/4+x=1/3
    =>-1/12+x=1/3
    =>x=1/3-(-1/12)
    =>x=1/3+1/12
    =>x=5/12
    Vậy x=5/12
    b)
    [1/2-x]^2=(-2)^2
    =>[1/2-x]^2=4
    =>[1/2-x]^2=2^2 hoặc [1/2-x]^2=(-2)^2
    =>\(\left[ \begin{array}{l}\frac{1}{2}-x=2\\\frac{1}{2}-x=-2\end{array} \right.\)
    =>\(\left[ \begin{array}{l}x=\frac{-3}{2}\\x=\frac{5}{2}\end{array} \right.\)
    Vậy x=-3/2 hoặc x=5/2
     

  2. a) 2/3 – (3/4 – x) = \sqrt{\frac{1}{9}}
    <=> 2/3 – 3/4 + x – 1/3 = 0
    <=> x – 3/4 + 1/3 = 0
    <=> x = 5/(12)
    Vậy x = 5/(12)
    b) (1/2 – x)^2 = (-2)^2
    <=> \(\left[ \begin{array}{l}\frac{1}{2}-x=2\\\frac{1}{2}x=-2\end{array} \right.\) 
    <=> \(\left[ \begin{array}{l}x=\frac{-3}{2}\\x=\frac{5}{2}\end{array} \right.\) 
    Vậy x = \frac{-3}{2} hoặc x = 5/2

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

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