(1+0.06/4)^4-1
    sqrt(45*45-(15+20sqrt(2))^2)
    45*45-(15+20sqrt(2))^2
    2000*(1-(1/1.05)^5)/0.05+1000*(1-(1/1.05)^10)/(0.05*1.05^5)
    0.5*4268^2*166/180*3.14-4236*sqrt(4268^2-4236^2)
    0.5*4268^2*arcsin(4236/4268)-4236*sqrt(4268^2-4236^2)
    lgx=－2121（（461.9166667/x）－1/373）+lg（101325）
    lgx=－979725.957/x+10.69
    70+975-132
    545+3850-510-3600
    185-(1730-1625)
    76.89-75*e^(-0.018)
    57+4.89-60*e^(-0.018)
    57+4.89-60*0.98
    76.89-75* 0.98
    0.982161031242649*75
    e^（-0.018）
    0.5*3.6%
    (960+100)/110%
    (960+100)/10%

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