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

Toán Lớp 8: C=(x^2-2xy+2y^2)(x^2+y^2)-2x^3y-3x^3y^2+2xy^3

Toán Lớp 8: C=(x^2-2xy+2y^2)(x^2+y^2)-2x^3y-3x^3y^2+2xy^3

Comments ( 2 )

  1. #tnvt
    C=(x^2-2xy+2y^2)(x^2+y^2)-2x^3y-3x^3y^2+2xy^3
    =x^4+x^2y^2-2x^3y-2xy^3+2x^2y^2+2y^4-2x^3y-3x^3y^2+2xy^3
    =x^4+(x^2y^2+2x^2y^2)+(-2x^3y-2x^3y)+(-2xy^3+2xy^3)+2y^4-3x^3y^2
    =x^4+3x^2y^2-4x^3y+2y^4-3x^3y^2
     

  2. Giải đáp+Lời giải và giải thích chi tiết:
    C=(x^2-2xy+2y^2)(x^2+y^2)-2x^3y-3x^3y^2+2xy^3
    C=x^4+x^2y^2-2x^3y-2x^3y+2x^2y^2+2y^4-2x^3y-3x^3y^2+2xy^3
    C=x^4+(x²y²+2x²y²)+(-2x³y-2x³y)+(-2xy³+2xy³)+2y^4-3x³y²
    C=x^4 + 3x^2y^2-4x^3y+2y^4-3x^3y^2

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