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

Toán Lớp 8: a(b^2 + c^2 ) + b(c^2 + a^2 ) + c(a^2 + b^2 ) + 3abc

Toán Lớp 8: a(b^2 + c^2 ) + b(c^2 + a^2 ) + c(a^2 + b^2 ) + 3abc

Comments ( 2 )

  1. Bạn tham khảo nhé.
    a(b^2+c^2)+b(c^2+a^2)+c(a^2+b^2)+3abc
    =ab^2+ac^2+bc^2+a^2b+a^2c+b^2c+3abc
    =ab^2+b^2c+abc+ac^2+bc^2+abc+a^2b+a^2c+abc
    =(ab^2+b^2c+abc)+(ac^2+bc^2+abc)+(a^2b+a^2c+abc)
    =b(ab+bc+ac)+c(ac+bc+ab)+a(ab+ac+bc)
    =(ab+bc+ac)(b+c+a)

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