giup minh voi cam on moi nguoi nhieu

giup minh voi
cam on moi nguoi nhieu

giup-minh-voi-cam-on-moi-nguoi-nhieu

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  1. Đáp án:

     `a)x=-1`

    `b) x=2/3`

    Giải thích các bước giải:

     `a)2x(x-5)-x(3+2x)=13`

    `⇔2x^2-10x-3x-2x^2=13`

    `⇔-13x=13`

    `⇔x=-1`

    vậy `x=-1`

    `b) 9x^2-12x+4=0`

    `⇔(3x)^2-2.3x.2+2^2=0`

    `⇔(3x-2)^2=0`

    `⇔3x-2=0`

    `⇔x=2/3`

    vậy `x=2/3`

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  2. `a, 2x(x – 5) – x(3 + 2x) = 13`

    `↔ 2x^2 – 10x – 3x – 2x^2 – 13 = 0`

    `↔ -13x – 13 = 0`

    `↔ -13x = 13`

    `↔ x = -1`

    `b, 9x^2 – 12x + 4 = 0`

    `↔ (3x – 2)^2 = 0`

    `↔ 3x – 2 = 0`

    `↔ x = 2/3`

     

    Reply

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