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

Toán Lớp 8: $x^{2}$ – x – 20 $x^{2}$ + x – 20 $2x^{2}$ – 5x + 2 $3x^{2}$ – 10x + 3 $2x^{2}$ + 5x – 3 Phân tích các đa thức thành nhân tử

Toán Lớp 8: $x^{2}$ – x – 20
$x^{2}$ + x – 20
$2x^{2}$ – 5x + 2
$3x^{2}$ – 10x + 3
$2x^{2}$ + 5x – 3
Phân tích các đa thức thành nhân tử

Comments ( 2 )

  1. $x²-x-20$
    $= (x+4)(x-5)$
    $x²+x-20$
    $= (x-4)(x+5)$
    $2x²-5x+2$
    $= (2x-1)(x-2)$
    $3x²-10x+3$
    $= (3x-1)(x-3)$
    $2x²+5x-3$
    $= (2x-1)(x+3)$
     

  2. x²-x-20
    =x²+4x-5x-20
    =x(x+4)-5(x+4)
    =(x+4)(x-5)
    x²+x-20
    =x²-4x+5x-20
    =x(x-4)+5(x-4)
    =(x-4)(x+5)
    2x²-5x+2
    =2x²-4x-x+2
    =2x(x-2)-(x-2)
    =(x-2)(2x-1)
    3x²-10x+3
    =3x²-x-9x+3
    =x(3x-1)-3(3x-1)
    =(3x-1)(x-3)
    2x²+5x-3
    =2x²+6x-x-3
    =2x(x+3)-(x+3)
    =(x+3)(2x-1)

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