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

Toán Lớp 8: Tính : (a+b)^4 ___________________

Toán Lớp 8: Tính : (a+b)^4
___________________

Comments ( 2 )

  1. (a+b)^4
    =[(a+b)^2]^2
    =[a^2 + 2ab + b^2 ]^2
    =(a^2 + 2ab + b^2 )(a^2 + 2ab + b^2 )
    =a^4 + 2a^3 .b + a^2 .b^2 + 2a^3 .b + 4a^2 .b^2 + 2ab^3 + a^2 .b^2 + 2ab^3 + b^4
    =a^4 + 4a^3 b + 6a^2 .b^2 + 4ab^3 + b^4

  2. Đáp án:
     
    Giải thích các bước giải:
     

    toan-lop-8-tinh-a-b-4

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

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