arctan（8/6）
    50*1281+25*2082-0.005*2082^2
    56545*256
    111111234+985633674635*4524537454
    55+55
    -(95*1569^2-298000*1569+132000000)/22
     -(95*1568^2-298000*1568+132000000)/22
     (95*1684^2-320000*1684+132000000)/22
    （95*1685^2-320000*1685+132000000）/22
    36-36*85%+36*10%
    lg26
    2189.64×6.91%
    2166.54×6.91%
    2126.81×6.91%
    (2166.54+2275.56+2126.81)/3
    (2097.26+2275.56+2126.81)/3
    （2007.62+2097.26+2275.56）/3
    2.43/(1+5%/5)
    1*5/(1+5%)+2*5/(1+5%)^2+3*5/(1+5%)^3+4*5/(1+5%)^4+5*5/(1+5%)^5
    1*5/(1+5%)+2*10.25/(1+5%)^2+3*15.76/(1+5%)^3+4*21.55/(1+5%)^4+5*27.63/(1+5%)^5

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