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*0.4)-arctan(0.01*0.4)-arctan(0.4/0.375)-arctan(0.4/84.85)+arctan(0.4/3)+arctan(0.4/0.61) 的值.
    题型：数学计算
    解:
          -90-arctan(0.1*0.4)-arctan(0.01*0.4)-arctan(0.4/0.375)-arctan(0.4/84.85)+arctan(0.4/3)+arctan(0.4/0.61)
        =-90-arctan0.04-arctan(0.01*0.4)-arctan(0.4/0.375)-arctan(0.4/84.85)+arctan(0.4/3)+arctan(0.4/0.61)
        =-90-arctan0.04-arctan0.004-arctan(0.4/0.375)-arctan(0.4/84.85)+arctan(0.4/3)+arctan(0.4/0.61)
        =-90-arctan0.04-arctan0.004-arctan1.066667-arctan(0.4/84.85)+arctan(0.4/3)+arctan(0.4/0.61)
        =-90-arctan0.04-arctan0.004-arctan1.066667-arctan0.004714+arctan(0.4/3)+arctan(0.4/0.61)
        =-90-arctan0.04-arctan0.004-arctan1.066667-arctan0.004714+arctan0.133333+arctan(0.4/0.61)
        =-90-arctan0.04-arctan0.004-arctan1.066667-arctan0.004714+arctan0.133333+arctan0.655738
        =-90-0.039979-arctan0.004-arctan1.066667-arctan0.004714+arctan0.133333+arctan0.655738
        =-90-0.039979-0.004-arctan1.066667-arctan0.004714+arctan0.133333+arctan0.655738
        =-90-0.039979-0.004-0.817645-arctan0.004714+arctan0.133333+arctan0.655738
        =-90-0.039979-0.004-0.817645-0.004714+arctan0.133333+arctan0.655738
        =-90-0.039979-0.004-0.817645-0.004714+0.132551+arctan0.655738
        =-90-0.039979-0.004-0.817645-0.004714+0.132551+0.580398
        =-90.039979-0.004-0.817645-0.004714+0.132551+0.580398
        =-90.043979-0.817645-0.004714+0.132551+0.580398
        =-90.861624-0.004714+0.132551+0.580398
        =-90.866338+0.132551+0.580398
        =-90.733787+0.580398
        =-90.153389
    答案:-90-arctan(0.1*0.4)-arctan(0.01*0.4)-arctan(0.4/0.375)-arctan(0.4/84.85)+arctan(0.4/3)+arctan(0.4/0.61)=-90.153389
    注：弧度制

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