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

Toán Lớp 8: X mũ 3 cộng cho 4 x mũ 2 trừ cho 7 x trừ cho 2 2 = 0

Toán Lớp 8: X mũ 3 cộng cho 4 x mũ 2 trừ cho 7 x trừ cho 2 2 = 0

Comments ( 1 )

  1. x^3+4x^2-7x-22=0
    <=> x^2+2x-11=0
    <=> (x+2)(x^2 +2x-11)=0
    TH1:
    x+2=0
    <=> x=-2
    TH2:
    x^2+2x-11=0
    <=> x=\frac{4-\sqrt{3}-2}{2}
    <=> x=2\sqrt{3}-1
    => x∈{-2;2\sqrt{3}-1}

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