3÷((1+6%)*(1+5%)*(1+3%))-1
    （ 5÷((1+6%)*(1+5%)*(1+4%)*(1+5%))-1）*100%
    5÷【(1+6%)*(1+5%)*(1+4%)*(1+5%)】-1
    =44000/（1+10%）^1+44000/（1+10%）^2+44000/（1+10%）^3
    20lg0.16/4.95
    20lg0.32/4.95
    20lg0.76/4.90
    20lg1.71/4.90
    20lg2.95/4.98
    20lg4.12/4.94
    20lg4.81/4.82
    arctan0.07
    arctan0.21
    (√5-1)^3*3+12*(√5-1)^2-6*(√5-1)-12
    (√5-1)^2
    √5-1
    -1√5
    √5
    625987000*19500^2
    625987000*380250000/5.6*10^15

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