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 arctan(0.49*103.34*0.112)-90-arctan(0.49)-arctan(0.5*0.49)-arctan(0.49*103.34) 的值.
    题型：数学计算
    解:
          arctan(0.49*103.34*0.112)-90-arctan(0.49)-arctan(0.5*0.49)-arctan(0.49*103.34)
        =arctan5.671299-90-arctan(0.49)-arctan(0.5*0.49)-arctan(0.49*103.34)
        =arctan5.671299-90-arctan0.49-arctan(0.5*0.49)-arctan(0.49*103.34)
        =arctan5.671299-90-arctan0.49-arctan0.245-arctan(0.49*103.34)
        =arctan5.671299-90-arctan0.49-arctan0.245-arctan50.6366
        =1.396264-90-arctan0.49-arctan0.245-arctan50.6366
        =1.396264-90-0.455616-arctan0.245-arctan50.6366
        =1.396264-90-0.455616-0.240267-arctan50.6366
        =1.396264-90-0.455616-0.240267-1.55105
        =-88.603736-0.455616-0.240267-1.55105
        =-89.059352-0.240267-1.55105
        =-89.299619-1.55105
        =-90.850669
    答案:arctan(0.49*103.34*0.112)-90-arctan(0.49)-arctan(0.5*0.49)-arctan(0.49*103.34)=-90.850669
    注：弧度制

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