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

Toán Lớp 8: Phân tíchđathứcthành nhân tu x²+(x-7)-49

Toán Lớp 8: Phân tíchđathứcthành nhân tu x²+(x-7)-49

Comments ( 2 )

  1. #tnvt
    x^2+(x-7)-49
    =x^2-49+(x-7)
    =(x-7)(x+7)+(x-7)
    =(x-7)(x+7+1)
    =(x-7)(x+8)

  2. x^2+(x-7)-49
    =(x^2-7^2)+(x-7)
    =(x-7)(x+7)+(x-7)
    =(x-7)(x+7+1)
    =(x-7)(x+8)
     

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

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