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

Toán Lớp 8: 1/ (x – 2)^2 – (x-3)(x+5) – 3x + 6 = 0 2/ (x-5)(9x+1) – (3x-2)^2 + 6x – 7 = 18 Tìm x nha mn

Toán Lớp 8: 1/ (x – 2)^2 – (x-3)(x+5) – 3x + 6 = 0
2/ (x-5)(9x+1) – (3x-2)^2 + 6x – 7 = 18
Tìm x nha mn

Comments ( 2 )

  1. 1) (x-2)^2-(x-3)(x+5)-3x+6=0
    ⇔x^2-4x+4-x^2-5x+3x+15-3x+6=0
    ⇔-9x=-6-4-15
    ⇔-9x=-25
    ⇔x=(25)/9
    Vậy x=(25)/9
    2) (x-5)(9x+1)-(3x^2-2)^2+6x-7=18
    ⇔9x^2+x-45x-5-9x^2+12x-4+6x-7=18
    ⇔-26x=18+7+4+5
    ⇔-26x=34
    ⇔x=-(17)/(13)
    Vậy x=-(17)/(13)

  2. 1)(x-2)^2-(x-3)(x+5)-3x+6=0
    =>x^2-4x+4-x^2-5x+3x+15-3x+6=0
    =>-9x+25=0
    =>-9x=-25
    =>x=(-25):(-9)
    =>x=25/9
    Vậy x=25/9
    2)(x-5)(9x+1)-(3x-2)^2+6x-7=18
    =>9x^2+x-45x-5-9x^2+12x-4+6x-7=18
    =>-26x-16=18
    =>-26x=18+16
    =>-26x=34
    =>x=34:(-26)
    =>x=-17/13
    Vậy x=-17/13
     

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