1/((1/10000)+((0.02*12.5)^2)/((1.96^2)*12.52))
    125000+(1.96*((12.52*(1-100/10000)*10000^2)/100)^0.5)
    125000-(1.96*((12.52*(1-100/10000)*10000^2)/100)^0.5)
    360-70-40-80
    72/5
    149/12
    4加3
    79+17+85+18
    1.06^4
    0.12^4
    (1.04)^2.02
    √325
    lg4661.184466/lg1.130
    4/1.004+4/1.004^2+4/1.004^3+104/1.004^4
    4/1.004 +4/1.004^2 +4/1.004^3 +4/1.004^4=
    arcsin30
    sinarcsin40
    arccos(2/sqrt910)
    arccos(sqrt(3)/3)
    sqrt8

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