（16.21*1000000+0.1361/x/x)*(x-0.0385*0.001) = 189*8.3145
    （16.21+0.1361/x/x)*(x-0.0385*0.001)＝189*8.3145
    55x^2－56x+14＝0
    6.5*6.5+(x-3.2)*(x-3.2)=x*x
    7x*（30-x）=90
    480000 = 10000*p*(1-5%)-1040000
    480000 = 20000*p*(1-5%)-1040000
    480000=20000*p*(1-5%)-600000
    400000=20000*p*(1-5%)-600000
    x(1+x)(1+0.01x)=25
    x(1+x)(1+0.01x)=25
    2x+5x*（30-x）=90
    2x+5x（30-x）=90
    x^2-96x+2400=100
    -0.1x^2+218x-12198.1675=0
    y=218-1219.81675/y
    12198.1675/x=218-x*1219.81675
    y=220-1219.81675/y-2
    x^2-x-312=0
    x+(x×0.05)=4792

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