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*20)-arctan(0.01*20)-arctan(20/0.375)-arctan(20/84.85)+arctan(20/3)+arctan(20/10.61) 的值.
    题型：数学计算
    解:
          -90-arctan(0.1*20)-arctan(0.01*20)-arctan(20/0.375)-arctan(20/84.85)+arctan(20/3)+arctan(20/10.61)
        =-90-arctan2-arctan(0.01*20)-arctan(20/0.375)-arctan(20/84.85)+arctan(20/3)+arctan(20/10.61)
        =-90-arctan2-arctan0.2-arctan(20/0.375)-arctan(20/84.85)+arctan(20/3)+arctan(20/10.61)
        =-90-arctan2-arctan0.2-arctan53.333333-arctan(20/84.85)+arctan(20/3)+arctan(20/10.61)
        =-90-arctan2-arctan0.2-arctan53.333333-arctan0.23571+arctan(20/3)+arctan(20/10.61)
        =-90-arctan2-arctan0.2-arctan53.333333-arctan0.23571+arctan6.666667+arctan(20/10.61)
        =-90-arctan2-arctan0.2-arctan53.333333-arctan0.23571+arctan6.666667+arctan1.885014
        =-90-1.107149-arctan0.2-arctan53.333333-arctan0.23571+arctan6.666667+arctan1.885014
        =-90-1.107149-0.197396-arctan53.333333-arctan0.23571+arctan6.666667+arctan1.885014
        =-90-1.107149-0.197396-1.552049-arctan0.23571+arctan6.666667+arctan1.885014
        =-90-1.107149-0.197396-1.552049-0.231485+arctan6.666667+arctan1.885014
        =-90-1.107149-0.197396-1.552049-0.231485+1.421906+arctan1.885014
        =-90-1.107149-0.197396-1.552049-0.231485+1.421906+1.083047
        =-91.107149-0.197396-1.552049-0.231485+1.421906+1.083047
        =-91.304545-1.552049-0.231485+1.421906+1.083047
        =-92.856594-0.231485+1.421906+1.083047
        =-93.088079+1.421906+1.083047
        =-91.666173+1.083047
        =-90.583126
    答案:-90-arctan(0.1*20)-arctan(0.01*20)-arctan(20/0.375)-arctan(20/84.85)+arctan(20/3)+arctan(20/10.61)=-90.583126
    注：弧度制

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