x^2-2x-20=0
    12x^2-240x+864=0
    z=lnz
    (4.895x-6289.323)^2+(x-1284.855)^2=55^2
    （x-3.5）/1.2=0.35
    200*（1+0.5*x）*(1-0.5*x)*250+100*(1+1.5*x)(1-5/6*x)*200*1.5=200
    3 = e^(-4x)+x*e^(-4x)
    5x^(2)-32x-112=0
    5x^(2)-32x-100=0
    2x+12??x-14250
    1.6*sin(90*x)=0.57*x
    12+448+x=14250
    1+x+896??54188
    0.002*0.75/(1+x)+0.005*0.75/(1+x)/(1+x)+0.01*0.75/(1+x)/(1+x)/(1+x)=1
    4x^4-13x^2+4x+1
    923200*0.002*0.75/(1+x)+923200*0.005*0.75/(1+x)/(1+x)+923200*0.01*0.75/(1+x)/(1+x)/(1+x)=923200
    x=(2√3)/((15)^0.5+(3)^0.5)
    x^3+36*x-12*x^2-32=0
    ((X-10000*6%-4000*9%)*(1-25%)-6000*10%)/1000=((X-600)*0.75-600)/1400
    x=(15)^0.5+(3)^0.5

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