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(0.1*30)-arctan(0.01*30)-arctan(30/0.375)-arctan(30/84.85)+arctan(30/3)+arctan(30/10.61) 的值.
    题型：数学计算
    解:
          -90-arctan(0.1*30)-arctan(0.01*30)-arctan(30/0.375)-arctan(30/84.85)+arctan(30/3)+arctan(30/10.61)
        =-90-arctan3-arctan(0.01*30)-arctan(30/0.375)-arctan(30/84.85)+arctan(30/3)+arctan(30/10.61)
        =-90-arctan3-arctan0.3-arctan(30/0.375)-arctan(30/84.85)+arctan(30/3)+arctan(30/10.61)
        =-90-arctan3-arctan0.3-arctan80-arctan(30/84.85)+arctan(30/3)+arctan(30/10.61)
        =-90-arctan3-arctan0.3-arctan80-arctan0.353565+arctan(30/3)+arctan(30/10.61)
        =-90-arctan3-arctan0.3-arctan80-arctan0.353565+arctan10+arctan(30/10.61)
        =-90-arctan3-arctan0.3-arctan80-arctan0.353565+arctan10+arctan2.827521
        =-90-1.249046-arctan0.3-arctan80-arctan0.353565+arctan10+arctan2.827521
        =-90-1.249046-0.291457-arctan80-arctan0.353565+arctan10+arctan2.827521
        =-90-1.249046-0.291457-1.558297-arctan0.353565+arctan10+arctan2.827521
        =-90-1.249046-0.291457-1.558297-0.339847+arctan10+arctan2.827521
        =-90-1.249046-0.291457-1.558297-0.339847+1.471128+arctan2.827521
        =-90-1.249046-0.291457-1.558297-0.339847+1.471128+1.230859
        =-91.249046-0.291457-1.558297-0.339847+1.471128+1.230859
        =-91.540503-1.558297-0.339847+1.471128+1.230859
        =-93.0988-0.339847+1.471128+1.230859
        =-93.438647+1.471128+1.230859
        =-91.967519+1.230859
        =-90.73666
    答案:-90-arctan(0.1*30)-arctan(0.01*30)-arctan(30/0.375)-arctan(30/84.85)+arctan(30/3)+arctan(30/10.61)=-90.73666
    注：弧度制

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