x－tan（x－1）
    0.25*3.14*X*X*6=2788.905383/(4-0.08X)+375.9100981
    1.7h+0.4h*h=13.29
    0=314.8530-0.4173x+0.0076x^2
    0.087y^2-1.7696y=314.8530
    X*(560-0.5*X)=50839.72028
    0.1300/x＝0.1289/0.86289
    0.4/100.58＝x/32.7
    x*（10^16+x）=10^32
    a*（10^16+a）=10^32
    3X+1/3=100
    2.5x=14
     sqrt(250+(x+1)^2)- sqrt(250+(x-1)^2)=0.005
     sqrt(250+(x+1)^2)- sqrt(25+(x-1)^2)=0.005
     sqrt(0.25+(x+0.001)^2)- sqrt(0.25+(x-0.001)^2)=0.000005
     sqrt(0.25+(x+0.000001)^2)- sqrt(0.25+(x-0.000001)^2)=0.000005
    1／x＋2＋1／x＋7＝1／x＋3＋1／x＋6
    14112-28224*x+14112*x*x=3360*x*x-5376*x+5376
    6x/(x+2000)＝3.73
    6x/(x+2000)＝1.66

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