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*0.8)-arctan(0.01*0.8)-arctan(0.8/0.375)-arctan(0.8/84.85)+arctan(0.8/3)+arctan(0.8/10.61) 的值.
    题型：数学计算
    解:
          -90-arctan(0.1*0.8)-arctan(0.01*0.8)-arctan(0.8/0.375)-arctan(0.8/84.85)+arctan(0.8/3)+arctan(0.8/10.61)
        =-90-arctan0.08-arctan(0.01*0.8)-arctan(0.8/0.375)-arctan(0.8/84.85)+arctan(0.8/3)+arctan(0.8/10.61)
        =-90-arctan0.08-arctan0.008-arctan(0.8/0.375)-arctan(0.8/84.85)+arctan(0.8/3)+arctan(0.8/10.61)
        =-90-arctan0.08-arctan0.008-arctan2.133333-arctan(0.8/84.85)+arctan(0.8/3)+arctan(0.8/10.61)
        =-90-arctan0.08-arctan0.008-arctan2.133333-arctan0.009428+arctan(0.8/3)+arctan(0.8/10.61)
        =-90-arctan0.08-arctan0.008-arctan2.133333-arctan0.009428+arctan0.266667+arctan(0.8/10.61)
        =-90-arctan0.08-arctan0.008-arctan2.133333-arctan0.009428+arctan0.266667+arctan0.075401
        =-90-0.07983-arctan0.008-arctan2.133333-arctan0.009428+arctan0.266667+arctan0.075401
        =-90-0.07983-0.008-arctan2.133333-arctan0.009428+arctan0.266667+arctan0.075401
        =-90-0.07983-0.008-1.13246-arctan0.009428+arctan0.266667+arctan0.075401
        =-90-0.07983-0.008-1.13246-0.009428+arctan0.266667+arctan0.075401
        =-90-0.07983-0.008-1.13246-0.009428+0.260603+arctan0.075401
        =-90-0.07983-0.008-1.13246-0.009428+0.260603+0.075259
        =-90.07983-0.008-1.13246-0.009428+0.260603+0.075259
        =-90.08783-1.13246-0.009428+0.260603+0.075259
        =-91.22029-0.009428+0.260603+0.075259
        =-91.229718+0.260603+0.075259
        =-90.969115+0.075259
        =-90.893856
    答案:-90-arctan(0.1*0.8)-arctan(0.01*0.8)-arctan(0.8/0.375)-arctan(0.8/84.85)+arctan(0.8/3)+arctan(0.8/10.61)=-90.893856
    注：弧度制

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