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

Toán Lớp 8: x^3+2x^2y+xy^2-4x giúp mik với ạ

Toán Lớp 8: x^3+2x^2y+xy^2-4x
giúp mik với ạ

Comments ( 2 )

  1. $\\$
    x^3+2x^2y+xy^2 – 4x
    =x(x^2+2xy + y^2 – 4)
    =x [(x+y)^2-2^2]
    =x(x+y-2)(x+y+2)
     

  2. x^3 + 2x^2y + xy^2 – 4x
    = x( x^2 + 2xy + y^2 – 4 )
    = x[(x^2 + 2xy + y^2) – 2^2]
    = x[(x+y)^2 – 2^2]
    = x( x + y + 2 )( x + y – 2 )

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

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