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

Toán Lớp 8: phân tích thành nhân tử x^4 + 7x ² – 6x + 7

Toán Lớp 8: phân tích thành nhân tử
x^4 + 7x ² – 6x + 7

Comments ( 2 )

  1. x^4+7x^2-6x+7
    =(x^4-x^3+x^2)+(x^3-x^2+x)+(7x^2-7x+7)
    =(x²-x+1)(x²+x+7)

  2. Giải đáp:
    x^4 + 7x ² – 6x + 7
    = x^4 – x^3 + x^3 + x^2 – x^2 + 7x^2 – x^3 + x^3 + x – 7x + 7
    = ( x^4 – x^3 + x^2 ) + (x^3 – x^2 + x ) + (7x^2 – 7x + 7)
    = x^2 ( x^2 – x + 1) + x( x^2 – x +1 ) + 7 ( x^2 – x + 1)
    = (x^2 + x + 7)( x^2 – x + 1)

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

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