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

Toán Lớp 9: -x(x+2)^2+(2x+1)^2+(x+3)(x^2-3x+9)-1

Toán Lớp 9: -x(x+2)^2+(2x+1)^2+(x+3)(x^2-3x+9)-1

Comments ( 2 )

  1. -x(x+2)^2+(2x+1)^2+(x+3)(x^2-3x+9)-1
    =-x3-4x2-4x+4x2+4x+1+x3-27-1
    =(-x3+x3)-(4x2-4x2)-(4x-4x)+(1-27-1)=-27
     

  2. -x(x+2)^2+(2x+1)^2+(x+3)(x^2-3x+9)-1
    =-x(x^2+4x+4)+4x^2+4x+1+x^3+27-1
    =-x^3-4x^2-4x+4x^2+4x+1+x^3+27-1
    =27
    (->Biểu thức không phụ thuộc vào biến)

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

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