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(10)-arctan(0.1*10)-arctan(0.02*10)-arctan(0.01*10)-arctan(20*10) 的值.
    题型：数学计算
    解:
          90+arctan(10)-arctan(0.1*10)-arctan(0.02*10)-arctan(0.01*10)-arctan(20*10)
        =90+arctan10-arctan(0.1*10)-arctan(0.02*10)-arctan(0.01*10)-arctan(20*10)
        =90+arctan10-arctan1-arctan(0.02*10)-arctan(0.01*10)-arctan(20*10)
        =90+arctan10-arctan1-arctan0.2-arctan(0.01*10)-arctan(20*10)
        =90+arctan10-arctan1-arctan0.2-arctan0.1-arctan(20*10)
        =90+arctan10-arctan1-arctan0.2-arctan0.1-arctan200
        =90+1.471128-arctan1-arctan0.2-arctan0.1-arctan200
        =90+1.471128-0.785398-arctan0.2-arctan0.1-arctan200
        =90+1.471128-0.785398-0.197396-arctan0.1-arctan200
        =90+1.471128-0.785398-0.197396-0.099669-arctan200
        =90+1.471128-0.785398-0.197396-0.099669-1.565796
        =91.471128-0.785398-0.197396-0.099669-1.565796
        =90.68573-0.197396-0.099669-1.565796
        =90.488334-0.099669-1.565796
        =90.388665-1.565796
        =88.822869
    答案:90+arctan(10)-arctan(0.1*10)-arctan(0.02*10)-arctan(0.01*10)-arctan(20*10)=88.822869
    注：弧度制

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