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

Toán Lớp 8: Thực hiện phép tính: e) (x + 3) (2x ² – 5x + 1)

Toán Lớp 8: Thực hiện phép tính:
e) (x + 3) (2x ² – 5x + 1)

Comments ( 2 )

  1. (x+3)(2x^2 – 5x + 1)
    = x(2x^2 – 5x + 1) +3(2x^2 – 5x + 1)
    = 2x^3 – 5x^2 + x + 6x^2 – 15x + 3
    = 2x^3 + (6x^2 – 5x^2) +(x-15x) + 3
    = 2x^3 + x^2 – 14x + 3

  2. e) (x + 3) (2x ² – 5x + 1)
    =2x^3-5x^2+x+6x^2-15x+3
    =2x^3+(-5x^2+6x^2)+(x-15x)+3
    =2x^3+x^2-14x+3
    #owen
     

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

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