（5x-400）-（4x-100）
    （5x-400）-（4x+100）
    5x-400-4x+100
    2.65x^2-34x+87.6=0
    2065x^2-34x-87.6=0
    6625x^2-x-1804668.8=0
    0.8*(0.4+tan(x)*tan(x))+(2.78*tan(x)+0.72)*sin(2*x)=1.21*tan(x)+(7.25*tan(x)+1.88)*cos(2*x)
    0.8*(0.4+tan(x)*tan(x))+(2.76*tan(x)+0.72)*sin(2*x)=1.21*tan(x)+(7.2*tan(x)+1.88)*cos(2*x)
    0.8*(0.4+tan(x)*tan(x))+(0.23*tan(x)+2.25)*sin(2*x)=1.21*tan(x)+(1.28*tan(x)+5.27)*cos(2*x)
    0.8*(0.4+tan(x)*tan(x))+(0.35*tan(x)+1.61)*sin(2*x)=1.21*tan(x)+(1.28*tan(x)+5.27)*cos(2*x)
    100*x*222.64/(x*222.64+(1-x)*0.5*335.17)=93.819
    100*x*222.64/(x*222.64+(1-x)*0.5*335.17)=92.800
    50x+70=55*（x-1）
    x-x*0.065-(X+360000)*0.0003=360000
    1000000*(1-1.56%)-（1000000/1.09*0.09-x/1.03*0.03）*1.12 = x
    1000000*0.9844-（1000000*1.09*0.09-x/1.03*0.03）*1.12=x
    8.6x=1.1%
    √1+x²
    18%=4%+X*10%
    13860=(220*72-x)*0.95

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