x/(x+15)=0.99
    x^2＝0.25*0.25+（x-0.1）^2
    -1.05781694593435=（1/x）*ln（1-x）
    X0.007=42.86
    （(3643-X-6140)/6140)*0.5=((1678+65+X)-3716)/3716
    (2100-X)/X=20%
    (10000-X)/X=-70%
    (500-X)/X=-9.4%
    (2100-X)/X=-20%
    (18000-X)/X=-41.5%
    (10000-X)/X=-19%
    （(3643-X-6140)/6140)*0.5=((1672+65+X)-3716)/3716
    (5200-X)/X=-1%
    (4670-X)/X=-11%
    (10000-X)/X=-8%
    (1500-X)/X=80%
    (6000-X)/X=17%
    (1800-X)/X=-14%
    （500-X)/X=-69%
    x^3=1

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