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

Toán Lớp 8: Phân tích đa thức thành nhân tử: 2x(x+3)^2 – (x+3) 2x(x-3)^2-3(3-x)

Toán Lớp 8: Phân tích đa thức thành nhân tử: 2x(x+3)^2 – (x+3)
2x(x-3)^2-3(3-x)

Comments ( 2 )

  1. a)
    2x (x+3)^2 – (x+3)
    =  (x+3) [ 2x (x+3) -1]
    = (x+3)(2x^2 + 6x-1)
    b)
    2x (x-3)^2 – 3 (3-x)
    = 2x (x-3)^2 + 3 (x-3)
    =  (x-3) [ 2x (x-3) + 3]
    = (x-3)(2x^2 – 6x+3)
     

  2. 2x(x+3)^2-(x+3)
    =(x+3)[2x(x+3)-1]
    =(x+3)[2x^2+6x-1]
    b,
    2x(x-3)^2-3(3-x)
    =2x(3-x)^2-3(3-x)
    =(3-x)[2x(3-x)-3]
    =(3-x)(6x-2x^2-3)
     

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

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