180+arctan(6*3^0.5/(-6))+arctan(6*3^0.5/(5-6))+arctan(6*3^0.5/(20-6))
    180+arctan(13.1/(-5.7))+arctan(13.1/(5-5.7))+arctan(13.1/(20-5.7))
    arctan0.92
    3737373737/7373737373*3
    -arcsin(13.1/(-5.7))-arcsin(13.1/(5-5.7))-arcsin(13.1/(20-5.7))
    0.75*(-8)-(-15)*（-5/3)
    -arctan(13.1/(-5.7))-arctan(13.1/(5-5.7))-arctan(13.1/(20-5.7))
    -arctan(6*3^0.5/(-6))-arctan(6*3^0.5/(5-6))-arctan(6*3^0.5/(20-6))
    8.3*3.7-1.11
    【2004-2.4】+【2002+2004.02-2002.04】-【0.5-2004.02+2002】+2002.04-101；8.3*3.7-7.4
    2010-【2010.09-2009.10+1】+【2.4+2010-2009.10】-2009.10+1；2005+【2009*2005-2008.9*2004.9+1】+【1.6+【2005-2004】/2.5-1】*2004
    4.7×1.08^3×2.33^5×1060
    2005+【2005-2004.05+2005.04】-【1.6+2005-2004.05】+2005.04-1
    e3/e2*1/e
    8/0.7
    10/0.7
    2010*2008+2009*2007-2008*2006-2007*2005；4.3+【2*【4.32+1.68】-1】/【2*2*3-1.0】+1/【0.75-1/0.4/10】-0.06+2008.06
    2010*2008-【2010+2008.2010-2010.2008】/【-1.0】*8-2010*【0+0.87+7.13】/4+0.01
    2008-【2007.08-2008.07】/【2007-2008+0.01】+【0.2008-1.2008】/【-3+2】
    0.75*0.16*0.0000000567*0.5*0.8*(973^4-789.6^4)

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