e^x=x
    cosx=e^x
    (cosx)^2=x
    x=cosx
    x=sinx
    x=(tanx)^2
    4*（52.2a+28.4*（a-31.8）+√（52.2a*28.4*（a-31.8）））=32000
    3*（52.2a+28.4*（a-23.8）+√（52.2a*28.4*（a-23.8）））=32000
    50 = 0.2166x - 3.33
    50 = 0.1833x - 4.998
    50 = 0.2x - 2.666
    50 = 0.4168x - 25.56
    0.375X-（1000+2.5%X）-1500=0
    x^2+2*x+4=0
    （x*x/9.2416-0.084）^2+4.62*x-0.47=0
    1050×x×（1+x）^7=1000x+50×(1+x)^7-50
    x-x*5.3%=1002141.3
    (x/20)×35%×100=15
    (x/80)×35%×100=15
    (x/80)*35%*100=10

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