总述：本次共解1题。其中
           ☆算术计算1题

〖1/1算式〗
    作业：求算式 90+arctan(13.8)-arctan(0.1*13.8)-arctan(0.02*13.8)-arctan(0.01*13.8)-arctan(10*13.8)+arctan(13.8*0.1394)-arctan(13.8*0.0377) 的值.
    题型：数学计算
    解:
          90+arctan(13.8)-arctan(0.1*13.8)-arctan(0.02*13.8)-arctan(0.01*13.8)-arctan(10*13.8)+arctan(13.8*0.1394)-arctan(13.8*0.0377)
        =90+arctan13.8-arctan(0.1*13.8)-arctan(0.02*13.8)-arctan(0.01*13.8)-arctan(10*13.8)+arctan(13.8*0.1394)-arctan(13.8*0.0377)
        =90+arctan13.8-arctan1.38-arctan(0.02*13.8)-arctan(0.01*13.8)-arctan(10*13.8)+arctan(13.8*0.1394)-arctan(13.8*0.0377)
        =90+arctan13.8-arctan1.38-arctan0.276-arctan(0.01*13.8)-arctan(10*13.8)+arctan(13.8*0.1394)-arctan(13.8*0.0377)
        =90+arctan13.8-arctan1.38-arctan0.276-arctan0.138-arctan(10*13.8)+arctan(13.8*0.1394)-arctan(13.8*0.0377)
        =90+arctan13.8-arctan1.38-arctan0.276-arctan0.138-arctan138+arctan(13.8*0.1394)-arctan(13.8*0.0377)
        =90+arctan13.8-arctan1.38-arctan0.276-arctan0.138-arctan138+arctan1.92372-arctan(13.8*0.0377)
        =90+arctan13.8-arctan1.38-arctan0.276-arctan0.138-arctan138+arctan1.92372-arctan0.52026
        =90+1.498459-arctan1.38-arctan0.276-arctan0.138-arctan138+arctan1.92372-arctan0.52026
        =90+1.498459-0.943726-arctan0.276-arctan0.138-arctan138+arctan1.92372-arctan0.52026
        =90+1.498459-0.943726-0.269296-arctan0.138-arctan138+arctan1.92372-arctan0.52026
        =90+1.498459-0.943726-0.269296-0.137134-arctan138+arctan1.92372-arctan0.52026
        =90+1.498459-0.943726-0.269296-0.137134-1.56355+arctan1.92372-arctan0.52026
        =90+1.498459-0.943726-0.269296-0.137134-1.56355+1.091414-arctan0.52026
        =90+1.498459-0.943726-0.269296-0.137134-1.56355+1.091414-0.479724
        =91.498459-0.943726-0.269296-0.137134-1.56355+1.091414-0.479724
        =90.554733-0.269296-0.137134-1.56355+1.091414-0.479724
        =90.285437-0.137134-1.56355+1.091414-0.479724
        =90.148303-1.56355+1.091414-0.479724
        =88.584753+1.091414-0.479724
        =89.676167-0.479724
        =89.196443
    答案:90+arctan(13.8)-arctan(0.1*13.8)-arctan(0.02*13.8)-arctan(0.01*13.8)-arctan(10*13.8)+arctan(13.8*0.1394)-arctan(13.8*0.0377)=89.196443
    注：弧度制

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