3-lg2.5
    3-lg2
    2304/25.0
    2304/25
    2^3-2*2+1
    0.5^3-2*0.5+1
    e-2.1
    e-0.64
    e-2.1
    arctan9.4339811320566038113206603776226
    180-90-arctan(sqrt(5))-arctan(0.2*sqrt(5))
    arctan9.43398
    sqrt(14)*sqrt(7)
    sqrt(9)+sqrt(7)
    12*(1-0.9703)*10^3/((2+0.73^2)*3.31*0.6544)
    12*(1-0.9703)*10^3/((2+0^2)*3.31*0.6544)
    12*(1-0.9703)/((2+0^2)*3.31*0.6544)
    12*(1-0.9703)/((2+0.85^2)*3.31*0.6544)
    2800000*0.0049/1-1/（1+0.0049）^360
    20ln20

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