4.5x^2-80x-18=0
    v
    76.5k÷0.85
    -1/x
    25+x×x=（25-x）（25-x）
    X/87-(75-X)/2000-5/44.7-5/45=0.21
    arctan(0.3*x)-arctan(x)-2*arctan(0.1*x)=-180
    0.61*{（x-sin（2πx）/2π）+（3x-1.25）*0.15}＝2/3*{（sin(πx）)^3/π}+0.15*500/550*{sin(πx)+sin(1.25π-2πx）}/π
    100+9*x^2=(1+x^2)*(1+0.01*x^2)
    (1+x^2)*(1+0.01*x^2)=100
    4000+400x-20x-2xx
    4000+1900x-50xx=1150
    （0.0008-x）/(0.0039-x)=(0.00161-1.2x)^1.2/(0.0012-1.2x)^1.2
    12x=5+2x
    x-0.78x=33
    x-[x×3.83×（102-95）]/2271=356.56
    x-[x×3.83×（102-95）]/2271=356.56
    x-[x×3.83×（102-95）]/2271=356.56
    x-[x×3.83×（102-95）]/2271=356.56
    5/6x+4=x

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