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(6.81*0.4643)-arctan(6.81*0.2)-arctan(6.81*0.5)-arctan(6.81*0.0464) 的值.
    题型：数学计算
    解:
          90+arctan(6.81*0.4643)-arctan(6.81*0.2)-arctan(6.81*0.5)-arctan(6.81*0.0464)
        =90+arctan3.161883-arctan(6.81*0.2)-arctan(6.81*0.5)-arctan(6.81*0.0464)
        =90+arctan3.161883-arctan1.362-arctan(6.81*0.5)-arctan(6.81*0.0464)
        =90+arctan3.161883-arctan1.362-arctan3.405-arctan(6.81*0.0464)
        =90+arctan3.161883-arctan1.362-arctan3.405-arctan0.315984
        =90+1.264483-arctan1.362-arctan3.405-arctan0.315984
        =90+1.264483-0.937475-arctan3.405-arctan0.315984
        =90+1.264483-0.937475-1.285142-arctan0.315984
        =90+1.264483-0.937475-1.285142-0.306056
        =91.264483-0.937475-1.285142-0.306056
        =90.327008-1.285142-0.306056
        =89.041866-0.306056
        =88.73581
    答案:90+arctan(6.81*0.4643)-arctan(6.81*0.2)-arctan(6.81*0.5)-arctan(6.81*0.0464)=88.73581
    注：弧度制

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