0.12706/x＝0.1289/0.86289
    0.12706/x＝0.1289/0.86289
    0.4/100.58＝x/31.95
    0.4/100.58＝x/31.95
    (25.343+x)×2.65＝50.687+69.08-x
    (25.343+x)×2.65＝50.687+69.08-x
    （25.343+x）×2.65＝50.687+69.08-x
    X-X(1-20%）*20%=10080
    X-｛X*(1 - 20%) × 30% - 2000｝=48287.04
    1/(2^x+1)
    1.31-cost-cos(72-t)-2√(1-cost)√(1-cos(72-t))
    34.53(sqrt(1-cos(72-t))-√(1-cost))=625+4768.7(1-cost)-3453√(1-cost)cos(76.5+0.5t)
    ((a)/(2))(1+ln((a+3)/(a)))=((18^(2)-(a+3)^(2))/(96.24-4a)
    ((a)/(2))(1+ln((a+3)/(a)))=((18^(2)-(a+3)^(2))/((96.24-4a)))
    450*（1+X）^3=510
    （5.6636-5.6636/1.13*0.13+0.13）/6.81=X
    （6.79-6.79/1.13*0.13+0.15）/6.81=X
    x/400000-x/500000=5
    257.6=-53.897x+243.76
    x*92%*1.01=500000

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