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(76*1.3)-arctan(2*1.3)-arctan(81*1.3) 的值.
    题型：数学计算
    解:
          90+arctan(76*1.3)-arctan(2*1.3)-arctan(81*1.3)
        =90+arctan98.8-arctan(2*1.3)-arctan(81*1.3)
        =90+arctan98.8-arctan2.6-arctan(81*1.3)
        =90+arctan98.8-arctan2.6-arctan105.3
        =90+1.560675-arctan2.6-arctan105.3
        =90+1.560675-1.203622-arctan105.3
        =90+1.560675-1.203622-1.5613
        =91.560675-1.203622-1.5613
        =90.357053-1.5613
        =88.795753
    答案:90+arctan(76*1.3)-arctan(2*1.3)-arctan(81*1.3)=88.795753
    注：弧度制

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