x^2-0.7*x-1=0
    x^2-0.5*x-1=0
    x^2-x-1=0
    x^2-3x-1=0
    x^0.5-3x-1=0
    0.5*x^0.5-3x-1=0
    0.5*x^2-3x-1=0
    x^2-3x-1=0
    x^2+10x-2000=0
    x^2+10x-1200=
    x^5-3x-1=0
    K=2606.5+104.26+0.01K+60.86+0.0002K+1108.65+0.0041K+0.0529K
    √2^x
    √2^x
    （500-x）*1000-50000=242000
    k^2-6k-23=0
    k^2-6k-23=0
    t^2+8t-10
    t^2+59t-2400
    0.9309x＾3-1.2325x＾2+0.9378x+0.0096 = 0

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