0.06/1
    2021×2019/2020
    2*3.1415926*(0*arccos(0)-(1-0)*arccos(1-0)+(1-0)^0.5)
    2*3.1415926*(0.5*arccos(0.5)-(1-0.5)*arccos(1-0.5)+(1-0.5*0.5)^0.5)
    2*3.1415926*(0.99*arccos(0.99)-(1-0.99)*arccos(1-0.99)+(1-0.99*0.99)^0.5)
    2*3.1415926*(1*arccos(1)-(1-1)*arccos(1-1)+(1-1*1)^0.5)
    2*3.1415926*(0.8866*arccos(0.8866)-(1-0.8866)*arccos(1-0.8866)+(1-0.8866*0.8866)^0.5)
    336800/(1+13%)*10%
    33680/（1+13%）*10%
    100/1.5
    sqrt（287633）
    7*0.8*[ln(0.6*6+1.5)-0.12]
    7*0.8*[ln(0.6*4.5+1.5)-0.12]*sqrt(3/14.3)
    7*0.8*[ln(0.6*3+1.5)-0.12]*sqrt(3/14.3)
    7*0.8*[ln(0.6*3+1.5)-0.12]*sqrt(3*14.3)
    （5*166+1*28）/（166+28）=
    2 -1 -3
    31+55
    e3.1415926535897932384626
    （0.5012*14.24*56.1）/2.01

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