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

Toán Lớp 8: a^3-a+b^3-b gáp ạaaaaaaaaaaaaaaa

Toán Lớp 8: a^3-a+b^3-b
gáp ạaaaaaaaaaaaaaaa

Comments ( 2 )

  1. a^3-a+b^3-b
    =(a^3+b^3)-(a+b)
    =(a+b).(a^2-ab+b^2)-(a+b)
    =(a+b).(a^2-ab+b^2-1)
    Áp dụng hđt: A^3+B^3=(A+B).(A^2-AB+B^2)

  2. a^3-a+b^3-b
    =( a^3+b^3)-(a+b)
    = (a+b)(a^2-ab+b^2)-(a+b)
    = (a+b)(a^2-ab+b^2-1)
     

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

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