（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
    arctan0.02x=24
    cos（-x）
    14t^2-120t十465=0
    Xx1.3=13
    (0.0002-x)(0.0003-1.5x)^1.5=(0.00005085-x)(0.00019915-1.5x)^1.5
    (0.0002-x)(0.0003-1.5x)^1.5=(0.00005-x)(0.0002-1.5x)^1.5
    (15.9*10^5+0.432/x^2)[x-0.0371*10^(-3)] = 8.314*348.15
    (15.9*10^5+0.432*300/17*300*17/x^2)[x-300/17*0.0371*10^(-3)]=300/17*8.314*348.15
    x-x*0.05-（X+704171.84）*0.0003=704171.84
    3.3/（10000+x）*x
    x^(2)-198.6 x-22500=0
    arctanx=45
    arctan（x/10）+arctanx=90

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