1000/3/x+460/x^2=109
    0.15x^2+1.2x+1=0
    （2+10x）/(x+1)=9.65
    (59-X)/59*100%
    （59-X）/59*100%
    20*(1+i)^3=21.5
    20*（1+i）^3=21.5
    （38.584+x）×2.05＝38.584+67.968-x
    （38.584+x）×2.2＝38.584+67.968-x
    （38.584+x）×2.35＝38.584+67.968-x
    （38.584+x）×2.5＝38.584+67.968-x
    （38.584+x）×2.5＝38.584+68.468-x
    （38.584+x）×2.35＝38.584+68.468-x
    （38.584+x）×2.2＝38.584+68.468-x
    （38.584+x）×2.05＝38.584+68.468-x
    3800x-5000（1+x）*8%*50%=0
    0.00924*x/0.394=0.00924*（60^2-x^2）/2/(410-12.52*2+12.52-0.394*x)
    （0.726÷2）×（√（1+8×（8.996^2））-1）=h
    0.00924*x/0.394=0.00924*（60^2-x^2）/2/(410-14.09*2+14.09-0.394*x)
    0.00924*x/0.394=0.00924*（60^2-x^2）/2/(410-14.09*2+14.09-0.394*x)

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