tanx=1/3
    0.3093-0.156288/x = 10800/1000000
    1=（4%+1）*（x+1)
    20*96485*(exp(0.5/0.0257-x+2)-exp(-0.5/0.0257+x+2))=0.0257*x*(120000000+100000*x*x)
    (150+268.5)/30*x+164/30*(x+15)+120/30(x+30)=620
    3^x=x^9
    3x^-7x-20=0
    3x^2-7x-20=0
    8.3335*x/(1-8.3335x)=30%
    (5016.2-y)/y＝2.1%
    (4998.3-y)/y＝1.9%
    (5112.7-y)/y＝2.0%
    (5042.1-y)/y＝2.6%
    (2110.6-y)/y＝3.1%
    (2110.6.2-y)/y＝3.1%
    (2115.2-y)/y＝3.1%
    (544.1-y)/y＝6.9%
    (525.4-y)/y＝7.3%
    (543.7-y)/y＝7.5%
    (575.3-y)/y＝7.1%

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