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

Toán Lớp 8: Chia đa thức (4x^4-14x^3y-24x^2y^2-54y^4):(x^2-3xy-9y^2)

Toán Lớp 8: Chia đa thức
(4x^4-14x^3y-24x^2y^2-54y^4):(x^2-3xy-9y^2)

Comments ( 1 )

  1. \qquad (4x^4-14x^3y-24x^2y^2-54y^4):(x^2-3xy-9y^2)
    =[(4x^4-12x^3y-36x^2y^2)-(2x^3y-6x^2y^2-18xy^3)+(6x^2y^2-18xy^3-54y^4)]:(x^2-3xy-9y^2)
    =[4x^2(x^2-3xy-9y^2)-2xy(x^2-3xy-9y^2)+6y^2(x^2-3xy-9y^2)]:(x^2-3xy-9y^2)
    =(x^2-3xy-9y^2)(4x^2-2xy+6y^2):(x^2-3xy-9y^2)
    =4x^2-2xy+6y^2

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

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