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

Toán Lớp 6: 1-(2x-5)^2=(-8) Giúp mình nhé các bạn

Toán Lớp 6: 1-(2x-5)^2=(-8)
Giúp mình nhé các bạn

Comments ( 2 )

  1. 1-(2x-5)^2=(-8)
    (2x-5)^2=1+8
    (2x-5)^2=9
    (2x-5)^2=3^2
    2x-5=3
    2x=3+5
    2x=8
    x=4

  2. 1-(2x-5)^2 = -8
    ⇒(2x-5)^2 = 1+8
    ⇒(2x-5)^2 = 9
    TH1 : 2x-5=3
    ⇒2x=3+5
    ⇒2x=8
    ⇒x=8:2
    ⇒x=4
    TH2:2x-5=-3
    ⇒2x=-3+5
    ⇒2x=2
    ⇒x=1
    Vậy x=4 hoặc x=1

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