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

Toán Lớp 8: (a+b) ^3+(b+c) ^3+(c+a) ^3-8(a+b+c) ^3

Home/ Toán Lớp 8: (a+b) ^3+(b+c) ^3+(c+a) ^3-8(a+b+c) ^3

Toán Lớp 8: (a+b) ^3+(b+c) ^3+(c+a) ^3-8(a+b+c) ^3

Tháng Mười 27, 2022 Toán học 1 Comment 0 views

Toán Lớp 8: (a+b) ^3+(b+c) ^3+(c+a) ^3-8(a+b+c) ^3

Comments ( 1 )

  1. haianhtu97
    haianhtu97
    27 Tháng Mười, 2022 at 8:33 sáng
    Reply
    (a+b) ^3+(b+c) ^3+(c+a) ^3-8(a+b+c) ^3
    =a^3 +3a^2 b+3ab^2 +b^3 +b^3 +3b^2 + 3bc^2 +c^3 +(c+a)^3 -8(a+b+c)^3
    =a^3 +3a^2 b+3ab^2 +b^3 +b^3 +3b^2 +c^3 +c^3 +3c^2 a+3ca^2 +a^3 -8(a+b+c)^3
    =-6a^3 -21a^2 b-21a^2 c-21ab^2 -21ac^2 -48abc-6b^3 -6c^3 -21bc^2 -21b^2 c

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

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