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

Toán Lớp 8: (????−1) (????^2+????+1) −???? (????^2+5)

Toán Lớp 8: (????−1) (????^2+????+1) −???? (????^2+5)

Comments ( 2 )

  1. Giải đáp:
     
    Lời giải và giải thích chi tiết:
     $(x-1)(x^2+x+1)-x(x^2+5)$
    $=(x-1)(x^2+x.1+1^2)-x.x^2-x.5$
    $=x^3-1-x^3-5x$
    $=-1-5x=-(1+5x)$

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