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
    7500/（x+52+12.48+10.4）+10000/（x+52+10.4）+10000/（x+10.4）+10000/（x+10.4）+10000/（x+10.4）=143
    50 = 7.6665x - 9.331
    7500/（x+52+12.48+10.4）+10000/（x+52+10.4）+10000/（x+10.4）+10000/（x+10.4）=143
    7500/（x+52+12.48+10.4）+10000/（x+52+10.4）+10000/（x+10.4）=143
    （39.402+x）×2.05＝39.402+71.604-x
    1250*（1+i）^-5=1000
    x*0.996=0.2631
    x*0.996=20.1316
    0.02=0.0076x^0.996
    0.153=0.0076x^0.996
    X^3
    4.191=（24.1*0.829*（x+0.1））/（1+0.829（x+0.1））*（100-9.66-1.06）/100*1/(1+0.31*1.06)+（2.86（x+0.1））/（1.31*0.101325）
    4.191=（26.99*0.829*（x+0.1））/（1+0.829（x+0.1））*（100-9.66-1.06）/100*1/(1+0.31*1.06)+（2.86（x+0.1））/（1.31*0.101325）

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