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

Toán Lớp 8: x (x-5) * (x+5) – (x-2) * (x^2+2x+4) = 3

Tháng Bảy 10, 2022 Toán học 2 Comments 0 views

Toán Lớp 8: x (x-5) * (x+5) – (x-2) * (x^2+2x+4) = 3

Comments ( 2 )

  1. thanhthuythu
    thanhthuythu
    10 Tháng Bảy, 2022 at 7:02 sáng
    Reply
    x(x-5)(x+5)-(x-2)(x^2+2x+4)=3
    ⇔x(x^2-25)-(x-2)(x^2+2x+2^2)=3
    ⇔x^3-25x-x^3+2^3=3
    ⇔(x^3-x^3)-25x=3-8
    ⇔-25x=-5
    ⇔x=1/5
    Vậy x=1/5
     

  2. behocgioitoan
    behocgioitoan
    10 Tháng Bảy, 2022 at 7:02 sáng
    Reply
    #huy
    x (x-5) . (x+5) – (x-2) . (x^2+2x+4) = 3
    <=>x(x^2-25)-(x^3-2^3)-3=0
    <=>x^3-25x-x^3+8-3=0
    <=>-25x+5=0
    <=>-25x=-5
    <=>x=1/5
    S={1/5}

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

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