（1+x）^10=4
    （1+x）^10=3
    （1+x）^10=2
     100*(0.06039exp(-(0.06039*x))-0.006626exp(-(0.006626*x)) )
     100*(0.06062exp(-(0.06062*x))-0.006026exp(-(0.006026*x)))
     100*(0.05845exp(-(0.05845*x))-0.005865exp(-(0.005865*x)))
    100*(0.05883exp(-(0.05883*x))-0.006199exp(-(0.006199*x)))
    2x+x(x-1)/2=14
    2x+x(x-1)=14
    a+a/11.3=92800
    a+a*11.3=101300
    a+a/11.3=101300
    8X^3-135X^2-6X+2=0
    (1-(x-30)/x)/0.811=((1-(x-60)/x)/0.811)^4
    1-(x-30)/x=(1-(x-60)/x)^4
    1.75*1890*4.8x*(0.8/x)^0.25=10000*(0.6/x+1)
    1.75*1890*4800x*(800/x)^0.25=10000*(600/x+1)
    (800/x)^0.25*1.75*1890*4800x/(600/x+1)=10000
    (0.00009295-x)(0.00040705-2x)^2=(0.0000246-x)(0.0002254-2x)^2
    (0.00009295-x)(0.00040705-1.5x)^1.5=(0.0000246-x)(0.0002254-1.5x)^1.5

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