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

Toán Lớp 7: a) 2/3 – 1/3 (x – 3/2) – 1/2 ( 2x+1) =5 b) ( x + 1/2 ) ( x – 3/4) = 0

Tháng Tám 4, 2022 Toán học 2 Comments 0 views

Toán Lớp 7: a) 2/3 – 1/3 (x – 3/2) – 1/2 ( 2x+1) =5
b) ( x + 1/2 ) ( x – 3/4) = 0

Comments ( 2 )

  1. baoquyen
    baoquyen
    4 Tháng Tám, 2022 at 5:10 chiều
    Reply
    Giải đáp + giải thích các bước giải:
    a, 2/3 – 1/3(x – 3/2) – 1/2(2x + 1) = 5
    2/3 – 1/3x + 1/2 – x – 1/2 = 0
    -(1/3x + x) + 2/3 = 0
    -4/3 x = 0 – 2/3
    -4/3 x = -2/3
    x = -2/3 : (-4)/3
    x = 1/2
    Vậy x = 1/2
    b, (x + 1/2)(x – 3/4) = 0
    \(\left[ \begin{array}{l}x + \dfrac{1}{2} = 0\\x – \dfrac{3}{4} = 0\end{array} \right.\) 
    \(\left[ \begin{array}{l}x =- \dfrac{1}{2} \\x = \dfrac{3}{4} \end{array} \right.\) 
    Vậy x \in {-1/2 ; 3/4}
     

  2. tuyen98
    tuyen98
    4 Tháng Tám, 2022 at 5:10 chiều
    Reply
    a) 2/3-1/3(x-3/2)-1/2(2x+1)=5
    = 2/3-1/3x+1/2-x-1/2 =5
    =-4/3x =13/3
             x=-13/4
    b) ( x + 1/2 ) ( x – 3/4) = 0
    \(\left[ \begin{array}{l}x+1/2=0\\x-3/4=0\end{array} \right.\)
    \(\left[ \begin{array}{l}x=0-1/2\\x=0+3/4 \end{array} \right.\)
    \(\left[ \begin{array}{l}x=-1/2\\x=3/4\end{array} \right.\)

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

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