2*2*2*2*2*2*2*2*2*2*2*2*2*2*2*2*2*2*2*2*2*2*2*2*2*2*2*2*2*3
    (-1+sqrt(1^2-4*1*(-4/9)))/2 (-1-sqrt(1^2-4*1*(-4/9)))/2 x^2+x-4/9=0
    3ln3-3
    770.5/2+1153/(1.414*8.7)
    65.5*26-110*5
    65.5*24-110*5
    arcsin0
    arctan1
    [1-1/(1+6.5%)^28.56]/ [1-1/(1+6.5%)^32.06]
    [1-1/(1+6.5%)^28.56]/ [1-1/(1+6.5%)^33.10]
    [1-1/(1+6.5%)^28.56]/ [1-1/(1+6.5%)^32.60]
    19800/（1+6.0%）^4
    18000/6.0%×（1-1/（1+6.0%）^3）
    1143300-1143300×((1-1/(1+6.0%)^4.26)/(1-1/(1+6.0%)^28.56))
    470+65.5*8+1413.25-32
    827.25/2+1895/(1.414*8.7)
    827.25/2+1895/(1.414*8.3)
    122.25*24-110*5
    122.25*20-110*5
    -2-1/4

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