s^3+6s^2+8s=4
    s^3+15s^2+50s=500
    -x^2-4x-1=0
    -x^2-4x-1=0
    40（1-X）^2 = 32.4
    40（1-X）^2=32.4
    40（1-X）2=32.4
    （x-30）（280-10（x-40）=3450
    1.5x+x+｛（1.5x+x）/2-280｝=5000
    400x^2-400x^4-1=0
    5x×4=7x×2.5
    （400—x）*（8+2x/25）=4800
    X-7920=0.3938X
    （x-7920）/x=39.38%
    X²-2x-3=0
    4x²-x-9=0
    x^4-399x^2-400=0
    x(2x+1)＝3
    x^4-4x^2+2=0
    2x^4-3x^2+2=0

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