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

Toán Lớp 8: Phân tích đa thức sau thành nhân tử:x³+2020x²-2020x+2021

Toán Lớp 8: Phân tích đa thức sau thành nhân tử:x³+2020x²-2020x+2021

Comments ( 2 )

  1. $\\$
    x^3+2020x^2-2020x+2021
    =x^3+2020x^2-2020x+2020+1
    =(x^3+1)+(2020x^2-202x+2020)
    =(x+1)(x^2-x+1)+2020(x^2-x+1)
    =(x^2-x+1)(x+1+2020)
    =(x^2-x+1)(x+2021)
     

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

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