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

Toán Lớp 8: Tìm x: `x-14=79-x/2.\overline{2(x-3)}`

Home/ Toán Lớp 8: Tìm x: `x-14=79-x/2.\overline{2(x-3)}`

Toán Lớp 8: Tìm x: `x-14=79-x/2.\overline{2(x-3)}`

Tháng Tám 23, 2022 Toán học 1 Comment 0 views

Toán Lớp 8: Tìm x:
x-14=79-x/2.\overline{2(x-3)}

Comments ( 1 )

  1. ngoclandiep
    ngoclandiep
    23 Tháng Tám, 2022 at 3:27 chiều
    Reply
    x-14=79-x/2 .\overline{2(x-2)}
    <=>x-14=79-x/2.(2.10+x-2)
    <=>x-14=79-x/2.(18+x)
    <=>x-14=79-9x-(x^2)/2
    <=>(x^2)/2+10x-93=0
    <=>1/2 x^2+1/2 .2.10.x+1/2 .100-1/2 .286=0
    <=>1/2(x^2+2.x.10+100-286)=0
    <=>(x+10)^2-(\sqrt{286})^2=0
    <=>(x+10-\sqrt{286})(x+10+\sqrt{286})=0
    <=>[(x=\sqrt{286}-10),(x=-\sqrt{286}-10):}
    Vậy x\in{+-\sqrt{286}-10}

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

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