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*80)-arctan(0.01*80)-arctan(80/0.375)-arctan(80/84.85)+arctan(80/3)+arctan(80/10.61) 的值.
    题型：数学计算
    解:
          -90-arctan(0.1*80)-arctan(0.01*80)-arctan(80/0.375)-arctan(80/84.85)+arctan(80/3)+arctan(80/10.61)
        =-90-arctan8-arctan(0.01*80)-arctan(80/0.375)-arctan(80/84.85)+arctan(80/3)+arctan(80/10.61)
        =-90-arctan8-arctan0.8-arctan(80/0.375)-arctan(80/84.85)+arctan(80/3)+arctan(80/10.61)
        =-90-arctan8-arctan0.8-arctan213.333333-arctan(80/84.85)+arctan(80/3)+arctan(80/10.61)
        =-90-arctan8-arctan0.8-arctan213.333333-arctan0.94284+arctan(80/3)+arctan(80/10.61)
        =-90-arctan8-arctan0.8-arctan213.333333-arctan0.94284+arctan26.666667+arctan(80/10.61)
        =-90-arctan8-arctan0.8-arctan213.333333-arctan0.94284+arctan26.666667+arctan7.540057
        =-90-1.446441-arctan0.8-arctan213.333333-arctan0.94284+arctan26.666667+arctan7.540057
        =-90-1.446441-0.674741-arctan213.333333-arctan0.94284+arctan26.666667+arctan7.540057
        =-90-1.446441-0.674741-1.566109-arctan0.94284+arctan26.666667+arctan7.540057
        =-90-1.446441-0.674741-1.566109-0.755986+arctan26.666667+arctan7.540057
        =-90-1.446441-0.674741-1.566109-0.755986+1.533314+arctan7.540057
        =-90-1.446441-0.674741-1.566109-0.755986+1.533314+1.438941
        =-91.446441-0.674741-1.566109-0.755986+1.533314+1.438941
        =-92.121182-1.566109-0.755986+1.533314+1.438941
        =-93.687291-0.755986+1.533314+1.438941
        =-94.443277+1.533314+1.438941
        =-92.909963+1.438941
        =-91.471022
    答案:-90-arctan(0.1*80)-arctan(0.01*80)-arctan(80/0.375)-arctan(80/84.85)+arctan(80/3)+arctan(80/10.61)=-91.471022
    注：弧度制

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