20lg1/(2x*sqrt(1-x^2))=8
    19x²-225x-650=0
    1/x+1/(1+x)+1/(3.5+x)=0
    63061600*(1+X)^6=102865000
    （24009.62-X/1.01*0.01）*1.12=273535.59-X
    5.88x-0.9x*x+100=0
    （26.326+x）×0.85＝52.652+76.778-x
    （26.326+x）×0.85＝52.652+75.778-x
    （26.326+x）×0.85＝52.652+74.778-x
    （26.326+x）×0.85＝52.652+73.778-x
    （26.326+x）×0.85＝52.652+72.778-x
    （26.326+x）×0.85＝52.652+71.778-x
    t^2-4t+3.75=0
    i-6%=1%*0.1105
    12000P-12000P*5%=374.4
    x(72-2x)=650
    x(20-2x)=60
    X=1-8.8%
    X=8.8%-1
    x+(x*0.359)=10000

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