0.493/（50/x+6.8）=0.507/（40/x+8.5）
    (X-1000*8%)*(1-25%)/(4500+1000)=(X-1000*8%)*(1-25%)/(4500+1000)
    x/3500-80/3500=x/4500-330/4500
    （x-80）/3500=（x-330）/4500
    23.2=-0.075X2+4.96X+3.26
    x/3500-80-3500=x/4500-330/4500
    13.07x=（3.5+x）×7.98
    （2883941.62+（2883941.62*0.09+x*0.09））*0.6+x=3000000
    （2883941.62+（2883941.62*0.09+x*0.09））*0.6+x=3000000
     10 = 14÷（1+X）^4
    3^ a=a^9
    0.1289÷0.86289＝0.128057÷x
    0.128057÷x＝0.1289÷0.86289
    0.128057÷x＝0.1289÷0.86289
    0.128057÷x＝0.1289÷0.86289
    0.128057÷x＝0.1289÷0.86289
    0.4÷（100+0.4+0.18）＝x÷32.2
    3^ a=a^9
    0.5*（299.56x+13.86x^2)*(449.34x+13.86x^2)/(898.68+41.58x)+31.21x-0.5*(299.56x+31.71x^2)*(449.34x+31.71x^2)/(898.68+95.13x)
    11.9*400*x+1610*300-（298320/x-660）*1610+0.9*215*2300.6-（318962/x-680）*2300.6 = 2500000

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