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

Toán Lớp 8: ( x+3 )^3 – 2^3 ( phân tích nhân thức thành nhân tử )

Toán Lớp 8: ( x+3 )^3 – 2^3 ( phân tích nhân thức thành nhân tử )

Comments ( 2 )

  1. (x+3)^3-2^3
    =[(x+3)-2][(x+3)^2+(x+3).2+2^2]
    =(x+3-2)(x^2+6x+9+2x+6+4)
    =(x+1)(x^2+8x+19)
     

  2. (x+3)^3-2^3
    =[(x+3)-2][(x+3)^2+(x+3).2+2^2]
    =(x+3-2)(x^2+6x+9+2x+6+4)
    =(x+1)(x^2+8x+19)
     

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

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