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

Toán Lớp 7: Tìm x biết A , 2phần3 =5phần 21 B , |x-1phần2|-V36=-25

Toán Lớp 7: Tìm x biết
A , 2phần3 =5phần 21
B , |x-1phần2|-V36=-25

Comments ( 2 )

  1. a x-$\frac{2}{3}$ =$\frac{5}{21}$
    x=$\frac{5}{21}$+$\frac{2}{3}$
     x= $\frac{19}{21}$ 
    vậy x =$\frac{19}{21}$ 
    |x-$\frac{1}{2}$ |-√36=-25
    |x-$\frac{1}{2}$ |-6=-25
    |x-$\frac{1}{2}$ |=-25+6
    |x-$\frac{1}{2}$ |=-19
    → x-$\frac{1}{2}$ = -19 hoặc x-$\frac{1}{2}$ = 19
        x = -19 + $\frac{1}{2}$ hoặc x = 19 + $\frac{1}{2}$
        x = -18,5 hoặc x=19,5

  2. a, x – 2/3 = 5/21
    => x = 5/21 + 2/3
    => x = 5/21 + 14/21
    => x = 19/21
    Vậy x = 19/21
    b, |x – 1/2| – sqrt(36) = -25
    => |x – 1/2| – 6 = -25
    => |x – 1/2| = -25 + 6
    => |x – 1/2| = -19
    => x in ∅
    Vì |x – 1/2| ≥ 0; -19 < 0
    Vậy x ∈ ∅

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