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(0.1*2000)-arctan(0.01*2000)-arctan(2000/0.375)-arctan(2000/84.85)+arctan(2000/3)+arctan(2000/10.61) 的值.
    题型：数学计算
    解:
          -90-arctan(0.1*2000)-arctan(0.01*2000)-arctan(2000/0.375)-arctan(2000/84.85)+arctan(2000/3)+arctan(2000/10.61)
        =-90-arctan200-arctan(0.01*2000)-arctan(2000/0.375)-arctan(2000/84.85)+arctan(2000/3)+arctan(2000/10.61)
        =-90-arctan200-arctan20-arctan(2000/0.375)-arctan(2000/84.85)+arctan(2000/3)+arctan(2000/10.61)
        =-90-arctan200-arctan20-arctan5333.333333-arctan(2000/84.85)+arctan(2000/3)+arctan(2000/10.61)
        =-90-arctan200-arctan20-arctan5333.333333-arctan23.571008+arctan(2000/3)+arctan(2000/10.61)
        =-90-arctan200-arctan20-arctan5333.333333-arctan23.571008+arctan666.666667+arctan(2000/10.61)
        =-90-arctan200-arctan20-arctan5333.333333-arctan23.571008+arctan666.666667+arctan188.501414
        =-90-1.565796-arctan20-arctan5333.333333-arctan23.571008+arctan666.666667+arctan188.501414
        =-90-1.565796-1.520838-arctan5333.333333-arctan23.571008+arctan666.666667+arctan188.501414
        =-90-1.565796-1.520838-1.570609-arctan23.571008+arctan666.666667+arctan188.501414
        =-90-1.565796-1.520838-1.570609-1.528397+arctan666.666667+arctan188.501414
        =-90-1.565796-1.520838-1.570609-1.528397+1.569296+arctan188.501414
        =-90-1.565796-1.520838-1.570609-1.528397+1.569296+1.565491
        =-91.565796-1.520838-1.570609-1.528397+1.569296+1.565491
        =-93.086634-1.570609-1.528397+1.569296+1.565491
        =-94.657243-1.528397+1.569296+1.565491
        =-96.18564+1.569296+1.565491
        =-94.616344+1.565491
        =-93.050853
    答案:-90-arctan(0.1*2000)-arctan(0.01*2000)-arctan(2000/0.375)-arctan(2000/84.85)+arctan(2000/3)+arctan(2000/10.61)=-93.050853
    注：弧度制

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