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(0.12×8.33)-arctan(0.02×8.33)-arctan(1/0.205×8.33)-arctan(1/23.894×8.33)+arctan(1/1.3×8.33)+arctan(1/7.073×8.33) 的值.
    题型：数学计算
    解:
          -90-arctan(0.12×8.33)-arctan(0.02×8.33)-arctan(1/0.205×8.33)-arctan(1/23.894×8.33)+arctan(1/1.3×8.33)+arctan(1/7.073×8.33)
        =-90-arctan0.9996-arctan(0.02×8.33)-arctan(1/0.205×8.33)-arctan(1/23.894×8.33)+arctan(1/1.3×8.33)+arctan(1/7.073×8.33)
        =-90-arctan0.9996-arctan0.1666-arctan(1/0.205×8.33)-arctan(1/23.894×8.33)+arctan(1/1.3×8.33)+arctan(1/7.073×8.33)
        =-90-arctan0.9996-arctan0.1666-arctan40.634148-arctan(1/23.894×8.33)+arctan(1/1.3×8.33)+arctan(1/7.073×8.33)
        =-90-arctan0.9996-arctan0.1666-arctan40.634148-arctan0.348627+arctan(1/1.3×8.33)+arctan(1/7.073×8.33)
        =-90-arctan0.9996-arctan0.1666-arctan40.634148-arctan0.348627+arctan6.407694+arctan(1/7.073×8.33)
        =-90-arctan0.9996-arctan0.1666-arctan40.634148-arctan0.348627+arctan6.407694+arctan1.17772
        =-90-0.785198-arctan0.1666-arctan40.634148-arctan0.348627+arctan6.407694+arctan1.17772
        =-90-0.785198-0.165084-arctan40.634148-arctan0.348627+arctan6.407694+arctan1.17772
        =-90-0.785198-0.165084-1.546191-arctan0.348627+arctan6.407694+arctan1.17772
        =-90-0.785198-0.165084-1.546191-0.335451+arctan6.407694+arctan1.17772
        =-90-0.785198-0.165084-1.546191-0.335451+1.415983+arctan1.17772
        =-90-0.785198-0.165084-1.546191-0.335451+1.415983+0.866826
        =-90.785198-0.165084-1.546191-0.335451+1.415983+0.866826
        =-90.950282-1.546191-0.335451+1.415983+0.866826
        =-92.496473-0.335451+1.415983+0.866826
        =-92.831924+1.415983+0.866826
        =-91.415941+0.866826
        =-90.549115
    答案:-90-arctan(0.12×8.33)-arctan(0.02×8.33)-arctan(1/0.205×8.33)-arctan(1/23.894×8.33)+arctan(1/1.3×8.33)+arctan(1/7.073×8.33)=-90.549115
    注：弧度制

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