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

Toán Lớp 8: (x+5) + ( x+1) + (x-2) (x^2+2x+ 4)- x ( x^2+ x-2) rứt gọn đa thức thành nhân tử

Toán Lớp 8: (x+5) + ( x+1) + (x-2) (x^2+2x+ 4)- x ( x^2+ x-2) rứt gọn đa thức thành nhân tử

Comments ( 1 )

  1. (x+5)+(x+1)+(x-2)(x^2+2x+4)-x.(x^2+x-2)
    =x+5+x+1+x^3-8-x^3-x^2+2x
    =(x^3-x^3)-x^2+(x+x+2x)+(5+1-8)
    =-x^2+4x-2

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