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

Toán Lớp 8: 2x^3-x+1=(x-3)(2x^2+6x+17)+52=? giúp mik nanh nhé

Toán Lớp 8: 2x^3-x+1=(x-3)(2x^2+6x+17)+52=? giúp mik nanh nhé

Comments ( 2 )

  1. 2x^3-x+1=(x-3)(2x^2+6x+17)+52
    <=>2x^3-x+1-2x^3-6x^2-17x+6x^2+18x+51-52=0
    <=>0x=0 (luôn đúng ∀x)
    Vậy phương trình đã cho luôn đúng ∀x.

  2. 2x^3-x+1=(x-3)(2x^2+6x+17)+52
    <=>2x^3-x+1=2x^3+6x^2+17x-6x^2-18x-51+52
    <=>2x^3-x+1=2x^3-x+1
    <=>2x^3-x-2x^3+x=1-1
    <=> 0x=0(luôn đúng)
    Vậy x inRR

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

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