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

Toán Lớp 8: (6x – 3).(3+6x) – 4.(3x+1).(3x-1)=0 tìm x

Toán Lớp 8: (6x – 3).(3+6x) – 4.(3x+1).(3x-1)=0 tìm x

Comments ( 2 )

  1. ~ Bạn tham khảo ~
    (6x – 3)(3+6x) – 4(3x+1)(3x-1)=0
    <=> 36x^2-9-4(9x^2 – 1)=0
    <=> 36x^2-9-36x^2+4=0
    <=> -5=0 (Vô lí)
    Vậy phương trình vô nghiệm

  2. (6x – 3)( 3 + 6x ) – 4( 3x + 1)( 3x – 1) = 0
    => 36x^{2} + 18x – 9 – 18x – 4.( 9x^{2} – 1) = 0
    => 39x^{2} – 9 – 36x^{2} + 4 = 0
    => -5 = 0 ( sai )
    => x ∈ ∅

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