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

Toán Lớp 8: (x-2)(x^2-5x+1)-x(x^2+11) mn giúp mk vs

Toán Lớp 8: (x-2)(x^2-5x+1)-x(x^2+11)
mn giúp mk vs

Comments ( 2 )

  1. Giải đáp:
    (x-2)(x^2-5x+1)-x(x^2+11)
    =x.x^2-x.5x+x-2x^2+2.5x-2-(x.x^2+11.x)
    =x^3-5x^2+x-2x^2+10x-2-(x^3+11x)
    =x^3-7x^2+11x-2-x^3-11x
    =(x^3-x^3)+(11x-11x)-7x^2-2
    =-7x^2-2

  2. Giải đáp:
     
    Lời giải và giải thích chi tiết:
    ( x – 2 )( x^2 – 5x + 1 ) – x ( x^2 + 11 )
    = ( x^3 – 5x^2 + x – 2x^2 + 10x – 2 ) – ( x^3 + 11x )
    = ( x^3 – 7x^2 + 11x – 2 ) – ( x^3 + 11x )
    = x^3 – 7x^2 + 11x – 2 – x^3 – 11x
    = – 7x^2 – 2

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

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