（2300+85+X）*6.1%=（360/180）*X
    2*3.14*(3*0.0617+1)*x-sin(2*3.14*x)-2.5*0.0617*3.14
    x/(sqrt(x^2+4))-(6-x)/(sqrt((6-x)^2+1))=0
    1.65×6x-1.5×5x=660
    7500/(230+74.88)+10000/(230+62.4)+20000/(230+10.4)=a
    7500/(222+74.88)+10000/(222+62.4)+20000/(222+10.4)=a
    7500/(220+74.88)+10000/(220+62.4)+20000/(220+10.4)=a
    7500/(220+74.88)+10000/(220+62.4)+20000/(220+10.4)=a
    7500/(300+74.88)+10000/(300+62.4)+20000/(300+10.4)=a
    7500/(300+74.88)+10000/(300+62.4)+30000/(300+10.4)=a
    7500/(260+74.88)+10000/(260+62.4)+30000/(260+10.4)=a
    7500/(230+74.88)+10000/(230+62.4)+30000/(230+10.4)=a
    7500/(210+74.88)+10000/(210+62.4)+30000/(210+10.4)=a
    7500/(a+74.88)+10000/(a+62.4)+30000/(a+10.4)=143
    7500/(a+74.88)+10000/(a+62.4)=143
    7500/(a+74.88)+10000/(a+62.4)+30000/(a+10.4)=143
    50 = 7.4995x - 10.997
    7500/(a+52+12.48+10.4)+10000/(a+52+10.4)+10000/(a+10.4)*3=143
    7500/(x+52+12.48+10.4)+10000/(x+52+10.4)+10000/(x+10.4)*3=143
    7500/（x+52+12.48+10.4）+10000/（x+52+10.4）+10000/（x+10.4)*3=143

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