（40-t）^0.75=0.27×（t-30）
    x（x－1）（x－2）（x－3）＝360
    x＾4－6x＾3＋11x＾2－6＝360
    (6350-X）/X=0.8
     （2300+85+X）*6.05%=（360/180）*X
    50 = 5.833x - 6.998
    50 = 5.999x - 6.66
    （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

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