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(0.12×50)-arctan(0.02×50)-arctan(1/0.205×50)-arctan(1/23.894×50)+arctan(1/1.3×50)+arctan(1/7.073×50) 的值.
    题型：数学计算
    解:
          -90-arctan(0.12×50)-arctan(0.02×50)-arctan(1/0.205×50)-arctan(1/23.894×50)+arctan(1/1.3×50)+arctan(1/7.073×50)
        =-90-arctan6-arctan(0.02×50)-arctan(1/0.205×50)-arctan(1/23.894×50)+arctan(1/1.3×50)+arctan(1/7.073×50)
        =-90-arctan6-arctan1-arctan(1/0.205×50)-arctan(1/23.894×50)+arctan(1/1.3×50)+arctan(1/7.073×50)
        =-90-arctan6-arctan1-arctan243.90245-arctan(1/23.894×50)+arctan(1/1.3×50)+arctan(1/7.073×50)
        =-90-arctan6-arctan1-arctan243.90245-arctan2.0926+arctan(1/1.3×50)+arctan(1/7.073×50)
        =-90-arctan6-arctan1-arctan243.90245-arctan2.0926+arctan38.46155+arctan(1/7.073×50)
        =-90-arctan6-arctan1-arctan243.90245-arctan2.0926+arctan38.46155+arctan7.06915
        =-90-1.405648-arctan1-arctan243.90245-arctan2.0926+arctan38.46155+arctan7.06915
        =-90-1.405648-0.785398-arctan243.90245-arctan2.0926+arctan38.46155+arctan7.06915
        =-90-1.405648-0.785398-1.566696-arctan2.0926+arctan38.46155+arctan7.06915
        =-90-1.405648-0.785398-1.566696-1.125005+arctan38.46155+arctan7.06915
        =-90-1.405648-0.785398-1.566696-1.125005+1.544802+arctan7.06915
        =-90-1.405648-0.785398-1.566696-1.125005+1.544802+1.430269
        =-91.405648-0.785398-1.566696-1.125005+1.544802+1.430269
        =-92.191046-1.566696-1.125005+1.544802+1.430269
        =-93.757742-1.125005+1.544802+1.430269
        =-94.882747+1.544802+1.430269
        =-93.337945+1.430269
        =-91.907676
    答案:-90-arctan(0.12×50)-arctan(0.02×50)-arctan(1/0.205×50)-arctan(1/23.894×50)+arctan(1/1.3×50)+arctan(1/7.073×50)=-91.907676
    注：弧度制

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