x^2+(24/5)^2=(x+18/5)^2
    （1.5x-x）*1.5=350
    （1.5x-x）*1.5
    0.1451sin(x)+0.21362*cos(x)+5.6545*cos(x)*sin(x/2)-0.071207 = 0
    0.1451sin(x)+0.21362*cos(x)+4.37998*cos(x)*sin(x/2)-0.071207 = 0
    0.11786sin(x)+0.4055*cos(x)+3.68144*cos(x)*sin(x/2)-0.13516 = 0
    0.11786sin(x)+0.4055*cos(x)+4.752704*cos(x)*sin(x/2)-0.13516 = 0
    0.0775sin(x)+0.5601*cos(x)+3.50594*cos(x)*sin(x/2)-0.18671 = 0
    0.0775sin(x)+0.5601*cos(x)+2.7157*cos(x)*sin(x/2)-0.18671 = 0
    0.7156*cos(x)+1.09158*cos(x)*sin(x/2)-0.23855 = 0
    0.7156*cos(x)+1.4092*cos(x)*sin(x/2)-0.23855 = 0
    x^2+x^2=625
    x^2/(0.05-x)=18.5
    x^2-3x-18=0
    (1-x)^3+3*x=1
    103（1+x）=121
    x^2-(825/32)x+8775/256
    5.05x^2=3.33(1-x)
    (x^2+1)^2(64*x^2-48*x-24)-(4*x+2)^2
    14x-x^2-48=0

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