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

Toán Lớp 7: Tìm x,biết 1.x^2 – \dfrac{16}{25} =0

Toán Lớp 7: Tìm x,biết
1.x^2 – \dfrac{16}{25} =0

Comments ( 2 )

  1. x^2-(16)/(25)=0
    ⇔x^2=(16)/(25)
    ⇔x=+-4/5
    Vậy x=+-4/5
     

  2. x^2 – 16/25 = 0
    ⇒x^2 = 0 + 16/25
    ⇒x^2 = 16/25
    ⇒x^2 = (4/5)^2
    ⇒x = ± 4/5
     

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

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