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

Toán Lớp 8: rút gọn đa thức: (x*x-1)*(x+2)-(x-2)*(x*x+2*x+4) (XIN CÁC BẠN GIÚP MÌNH)

Toán Lớp 8: rút gọn đa thức: (x*x-1)*(x+2)-(x-2)*(x*x+2*x+4)
(XIN CÁC BẠN GIÚP MÌNH)

Comments ( 2 )

  1. ( x.x – 1 ) ( x + 2 ) – ( x – 2 ) ( x.x + 2x + 4 )
    = ( x^2 – 1 ) ( x + 2 ) – ( x – 2 ) ( x^2 + 2x + 4 )
    = ( x^2 – 1 ) ( x + 2 ) – ( x^3 – 2^3 )
    = x^3 + 2x^2 – x – 2 – x^3 + 8
    = 2x^2 – x + 6
     

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

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