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

Toán Lớp 8: Thực hiện phép nhân: (a+b)(a^2-ab+b^2)[a^6-(ab)^3+b^6

Toán Lớp 8: Thực hiện phép nhân:
(a+b)(a^2-ab+b^2)[a^6-(ab)^3+b^6

Comments ( 2 )

  1. #Sad
    (a+b)(a^2-ab+b^2)[a^6-(ab)^3+b^6]
    = (a^3+b^3)[a^6-(ab)^3+b^6]
    = a^9-a^6b^3+a^3b^6+a^6b^3-a^3b^6+b^9
    = (-a^6b^3+a^6b^3)+(a^3b^6-a^3b^6)+a^9+b^9
    = a^9+b^9
     

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

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