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

Toán Lớp 8: Tìm X biết (2x+1/3)^2 – (1-2x)^2 = 16/9

Toán Lớp 8: Tìm X biết
(2x+1/3)^2 – (1-2x)^2 = 16/9

Comments ( 2 )

  1. Giải đáp:
    (2x+1/3)^2-(1-2x)^2=16/9
    <=> 4x^2+4/3x+1/9-x+4x-4x^2=16/9
    <=> 16/3x-8/9=16/9
    <=> 48x-8=16
    <=> 48x=16+8
    <=> 48x=24
    <=> x=24/48
    <=> x=1/2
    Vậy phương trình có tập nghiệm S={1/2}

  2. (2x+1/3)^2-(1-2x)^2=16/9
    <=> (2x+1/3-1+2x)(2x+1/3+1-2x)=16/9
    <=> (4x-2/3).4/3=16/9
    <=> 4x-2/3=16/9 : 4/3
    <=> 4x-2/3=4/3
    <=> 4x=4/3+2/3
    <=> 4x=2
    <=> x=2/4
    <=> x=1/2
    Vậy x=1/2

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