[11*sqrt(50^2*1^2+1)]/[1*sqrt(1^2+1)*sqrt(1+1/16*1^2)*sqrt(1+2500^2*1^2)]
    20lg15.550134
    [11*sqrt(50^2*0.02^2+1)]/[0.02*sqrt(0.02^2+1)*sqrt(1+1/16*0.02^2)*sqrt(1+2500^2*0.02^2)]
    20lg19438
    [11*sqrt(50^2*0.0004^2+1)]/[0.0004*sqrt(0.0004^2+1)*sqrt(1+1/16*0.0004^2)*sqrt(1+2500^2*0.0004^2)]
    1321003963011889035667107*757
    440334654777631*2270999997729
    49.23×10^-6×6000×24
    sqrt11
    20lg11
    arctan-0.75
    73260.07+83859.97+92153.82+126584.91+128800.28-250000
    73260.07+83859.97+92153.82+126584.91+128800.28
    200000/（1+9.2%）^5=
    180000/（1+9.2%）^4=
    120000/（1+9.2%）^3=
    100000/（1+9.2%）^2
    100000/（1+9.2%）^2-250000
    80000/（1+9.2%）^1-250000
    -250000*（1+9.2%）^-1=

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