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

Toán Lớp 8: ????^2 + ????^2 + ????^2 + 2???????? + 2???????? + 2????????

Toán Lớp 8: ????^2 + ????^2 + ????^2 + 2???????? + 2???????? + 2????????

Comments ( 2 )

  1. a^2+b^2+c^2+2ab+2bc+2ca
    =(a^2+2ab+b^2)+c^2+2c(a+b)
    =(a+b)^2+2(a+b)c+c^2
    =(a+b+c)^2 (ĐPCM)
     

  2. Giải đáp:
     
    Lời giải và giải thích chi tiết:
    ????^2 + ????^2 + ????^2 + 2???????? + 2???????? + 2????????
    =(????^2+ 2????????+ ????^2) + ????^2 +2b(a+c)
    =$(a+b)^{2}$ + ????^2 +2b(a+c)
    =$(a+b+c)^{2}$ 

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

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