104.2*（1+x）^6=107.4
    （1.486-1.497）*1000+（y-1.497）*700-0.1-0.1=1
    （1.486-1.488）*300+（y-1.488）*400-0.1-0.1=1
    0.605x+x=985.1
    （x-1.488）*700-0.1=1
    9x^2-9x+5=0
    （77-x）2+x=80
    （40-x）2+x=80
    （26-x）2+x=80
    （26-x）2-x=80
    0.0256*1*(0.24/2/0.0256-x)=(1200*6.02*10^23/3.14/0.72*10^9)^0.5*(e^(x/2)-e^(-x/2))/2*1.6/10^19
    0.0256*2*(0.24/2/0.0256-x)=(1200*6.02*10^23/3.14/0.72*10^9)^0.5*(e^(x/2)-e^(-x/2))/2*1.6/10^19
    0.0256*2*(0.24/2/0.0256-x)=(200*6.02*10^23/3.14/0.72*10^9)^0.5*(e^(x/2)-e^(-x/2))/2*1.6/10^19
    (25×2+2x)×0.9＝25×2+2(x+4)
    16x²+9x²=1
    150*21.1x*（1-0.002/3/0.0033）=157*360-157*0.0018*200+200*157*0.0033*(165/x-1)+240000*150*0.0033*0.167*(200/x-1)
    21.1*150x=360*157+150*0.167*0.0106*240000
    21.1*150x=360*157+150*0.167*0.0075*240000
    99-x÷2=4
    108+ x =0.618x(180+ x )

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