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

Toán Lớp 8: (5x-1)(1/10y^3-2y^2-2/5y) b,(x+3)(x^2-3x+9)

Toán Lớp 8: (5x-1)(1/10y^3-2y^2-2/5y)
b,(x+3)(x^2-3x+9)

Comments ( 2 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
     (5x-1)(1/10 y^3-2y^2-2/5y)
    =1/2 xy^3-10xy^2-2xy-1/10 y^3+2y^2+2/5 y
    (x+3)(x^2-3x+9)
    =x^3+3^3
    =x^3+27

  2. (5x-1)(1/10y^3-2y^2-2/5y)
    =1/2xy^3-10xy^2-2xy-1/10y^3+2y^2+2/5y
     (x+3)(x^2-3x+9)
    =(x+3)(x^2-x.3+3^2)
    =x^3+3^3
    =x^3+27.

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

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