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

Toán Lớp 8: phân tích đa thức thành nhân tử x^2+xy+2x+2y X^2-7x X^2-3x+2

Toán Lớp 8: phân tích đa thức thành nhân tử
x^2+xy+2x+2y
X^2-7x
X^2-3x+2

Comments ( 2 )

  1. @Bao
    x^2+xy+2x+2y
    =x(x+y)+2(x+y)
    =(x+y)(x+2)
    x^2-7x
    =x(x-7)
    x^2-3x+2
    =x^2-x-2x+2
    =x(x-1)-2(x-1)
    =(x-1)(x-2)

  2. $\text{$x^{2}$ + xy + 2x + 2y}$
    $\text{= x( x + y ) + 2( x + y )}$
    $\text{= ( x + y )( x + 2 )}$
    ______________________________
    $\text{$x^{2}$ – 7x}$
    $\text{= x( x – 7 )}$
    ______________________________
    $\text{$x^{2}$ – 3x + 2}$
    $\text{= $x^{2}$ – x – 2x + 2}$
    $\text{= x( x – 1 ) – 2( x – 1 )}$
    $\text{= ( x – 1 )( x – 2 )}$
    @мoe

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