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*13)-arctan(0.02*13)-arctan(0.04*13)-arctan(5.1*13)+arctan(0.77*13)+arctan(0.1476*13) 的值.
    题型：数学计算
    解:
          90-arctan(0.12*13)-arctan(0.02*13)-arctan(0.04*13)-arctan(5.1*13)+arctan(0.77*13)+arctan(0.1476*13)
        =90-arctan1.56-arctan(0.02*13)-arctan(0.04*13)-arctan(5.1*13)+arctan(0.77*13)+arctan(0.1476*13)
        =90-arctan1.56-arctan0.26-arctan(0.04*13)-arctan(5.1*13)+arctan(0.77*13)+arctan(0.1476*13)
        =90-arctan1.56-arctan0.26-arctan0.52-arctan(5.1*13)+arctan(0.77*13)+arctan(0.1476*13)
        =90-arctan1.56-arctan0.26-arctan0.52-arctan66.3+arctan(0.77*13)+arctan(0.1476*13)
        =90-arctan1.56-arctan0.26-arctan0.52-arctan66.3+arctan10.01+arctan(0.1476*13)
        =90-arctan1.56-arctan0.26-arctan0.52-arctan66.3+arctan10.01+arctan1.9188
        =90-1.000756-arctan0.26-arctan0.52-arctan66.3+arctan10.01+arctan1.9188
        =90-1.000756-0.254368-arctan0.52-arctan66.3+arctan10.01+arctan1.9188
        =90-1.000756-0.254368-0.479519-arctan66.3+arctan10.01+arctan1.9188
        =90-1.000756-0.254368-0.479519-1.555715+arctan10.01+arctan1.9188
        =90-1.000756-0.254368-0.479519-1.555715+1.471227+arctan1.9188
        =90-1.000756-0.254368-0.479519-1.555715+1.471227+1.090365
        =88.999244-0.254368-0.479519-1.555715+1.471227+1.090365
        =88.744876-0.479519-1.555715+1.471227+1.090365
        =88.265357-1.555715+1.471227+1.090365
        =86.709642+1.471227+1.090365
        =88.180869+1.090365
        =89.271234
    答案:90-arctan(0.12*13)-arctan(0.02*13)-arctan(0.04*13)-arctan(5.1*13)+arctan(0.77*13)+arctan(0.1476*13)=89.271234
    注：弧度制

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