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

Toán Lớp 8: (x-2)(x+3)-(x+4)(x-7)=5-x. tìm x

Toán Lớp 8: (x-2)(x+3)-(x+4)(x-7)=5-x. tìm x

Comments ( 2 )

  1. (x-2)(x+3)-(x+4)(x-7)=5-x
    ⇔x^2+3x-2x-6-x^2+7x-4x+28+x-5=0
    ⇔5x+17=0
    ⇔5x=-17
    ⇔x=-(17)/(5)
    Vậy S={-(17)/(5)}

  2. $(=) x^2 + 3x – 2x – 6 – x^2 + 3x + 28 = 5-x$
    $(=)4x+22=5-x$
    $(=) 4x+x=5-22$
    $(=)5x=-17$
    $=)x=-17/5$

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