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

Toán Lớp 8: phân tích đa thức thành nhân tử : (3x + 1)2 – (x + 1)2

Toán Lớp 8: phân tích đa thức thành nhân tử : (3x + 1)2 – (x + 1)2

Comments ( 2 )

  1. \qquad (3x+1)^2-(x+1)^2
    =[(3x+1)-(x+1)][(3x+1)+(x+1)]
    =(3x+1-x-1)(3x+1+x+1)
    =2x.(4x+2)
    =4x(2x+1)
     

  2. Áp dụng : A^2-B^2=(A-B).(A+B)
    (3x+1)^2-(x+1)^2
    =(3x+1-x-1).(3x+1+x+1)
    =2x.(4x+2)
    =4x.(2x+1)
     

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

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