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

Toán Lớp 8: (x + 1) ( x+ 2 )- x (x+1) 3x(x^2-2x-1)

Toán Lớp 8: (x + 1) ( x+ 2 )- x (x+1)
3x(x^2-2x-1)

Comments ( 2 )

  1. (x + 1)(x + 2) – x(x + 1)
    Đề 1: Phân tích đa thức thành nhân tử
    = (x + 1)(x + 2 – x)
    = 2(x + 1)
    Đề 2: Rút gọn biểu thức
    (x + 1)(x + 2) – x(x + 1)
    = x^2 + x + 2x + 2 – x^2 – x
    = 2x + 2
     

  2. (x+1)(x+2)-x(x+1)
    =x^2 +2x+x+2-x^2 -x
    =2x-x^2

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

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