（18000+8600X）÷2=66000+8600X-2417X
    23.2%=105%+r+105%*r
    x^2-4x+11=0
    x+0.08x+(x+0.08)*0.03=8100
    (4x+1)(3x+1)(2x+1)(x+1)=3x^4
    a^2-4a+2=0
    12x^4+4x^3-41x^2+4x+12=0
    (110500-x)/120000=0.1
    x+x²-600＝0
    1+log(x)+(500000-500000*log(x))/(x*x)
    n^2-n=240
    (x*10-30)/12=29.8
    (x*10-30)/12
    100*(0.0559*exp(-(0.0559*x))-0.00616*exp(-(0.00616*x)))
    100*(0.05053*exp(-(0.05053*x))-0.00484*exp(-(0.00484*x)))
     100*(0.04878*exp(-(0.04878*x))-0.0043*exp(-(0.0043*x)))
    100*(0.05151*exp(-(0.05151*x))-0.00459*exp(-(0.00459*x)))
    xe^sinx
    1.2*1000000=8.314*408.1/(x-0.000072360)-1.5883/(x*x+2*0.000072360*x-0.000072360*0.000072
    1.2*1000000=8.314*408.1/(x-0.000072360)-1.5883/(x*x+2*0.000072360*x-0.000072360*0.000072360)

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