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

Toán Lớp 8: x(x-2)-(x-3)(x+3)=0 Giúp mình làm với ạ

Toán Lớp 8: x(x-2)-(x-3)(x+3)=0
Giúp mình làm với ạ

Comments ( 2 )

  1. ~ Bạn tham khảo ~
    x(x-2) – (x-3)(x+3)=0
    <=> x^2-2x – x^2+9=0
    <=> -2x+9=0
    <=> -2x=-9
    <=> x=9/2
    Vậy x=9/2

  2.       x(x-2)-(x-3)(x+3)=0
    => x^2 -2x-x^2 +9=0
    => -2x+9=0
    => -2x=-9
    => x=-9:(-2)
    => x=9/2

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