3^a = a^9
    300/（500-200-x）=1.5
    300/500-200-x=1.5
    300/500-200-x=1.5
    300/500-200-x=1.5
    300/500-200-x=1.5
    3200=V+0.0305V+1020.00+40.80+128.00+0.253539V+138.21+180.80+178.32
    500-200/500-200-x=1.5
    12000+x/1.05*0.05=x
    1000000*（1-1.56%）-25000-262301.27-（1000000/1.09*0.09-x/1.03*0.03-26272/1.13*0.13）*1.12=x
    n(n+1)=4048
    （39.402+x）×1.95＝39.402+72.104-x
    （39.402+x）×1.95＝39.402+72.604-x
    x*1.1＝4621
    8.619+x=0.2*(57.46+x)
    ln(1+x)
    2(1+x)^2=128
    lnx＝54.95
    x^2+x=4030
    10000/180+17500/(x+0.16*102)=150

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