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

Toán Lớp 7: 61/20 – 4 ( x – 1/2 ) ² = √16/ 25

Toán Lớp 7: 61/20 – 4 ( x – 1/2 ) ² = √16/ 25

Comments ( 2 )

  1. 61/20 – 4( x – 1/2 )^2 = √16/25
                4( x – 1/2 )^2 = 61/20 – 4/5
                4( x – 1/2 )^2 = 9/4
                 ( x – 1/2 )^2 = 9/16
                ( x – 1/2 )^2 = (±3/4)^2
     =>      x – 1/2         = ±3/4
    ⇔        x – 1/2         = 3/4
    =>       x                  = 5/4
    ⇔        x – 1/2         = -3/4
    =>       x                 = -1/4
    Vậy x = 5/4 hoặc x = -1/4

  2. Giải đáp+giải thích các bước giải:
    61/20 – 4( x – 1/2 )^2 = √16/25
                4( x – 1/2 )^2 = 61/20 – 4/5
                4( x – 1/2 )^2 = 9/4
                 ( x – 1/2 )^2 = 9/16
                ( x – 1/2 )^2 = (±3/4)^2
     =>      x – 1/2         = ±3/4
    ⇔        x – 1/2         = 3/4
    =>       x                  = 5/4
    ⇔        x – 1/2         = -3/4
    =>       x                 = -1/4
    Vậy x = 5/4 hoặc x = -1/4

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