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           ☆算术计算1题

〖1/1算式〗
    作业：求算式 -90-arctan(0.1*500)-arctan(0.01*500)-arctan(500/0.375)-arctan(500/84.85)+arctan(500/3)+arctan(500/10.61) 的值.
    题型：数学计算
    解:
          -90-arctan(0.1*500)-arctan(0.01*500)-arctan(500/0.375)-arctan(500/84.85)+arctan(500/3)+arctan(500/10.61)
        =-90-arctan50-arctan(0.01*500)-arctan(500/0.375)-arctan(500/84.85)+arctan(500/3)+arctan(500/10.61)
        =-90-arctan50-arctan5-arctan(500/0.375)-arctan(500/84.85)+arctan(500/3)+arctan(500/10.61)
        =-90-arctan50-arctan5-arctan1333.333333-arctan(500/84.85)+arctan(500/3)+arctan(500/10.61)
        =-90-arctan50-arctan5-arctan1333.333333-arctan5.892752+arctan(500/3)+arctan(500/10.61)
        =-90-arctan50-arctan5-arctan1333.333333-arctan5.892752+arctan166.666667+arctan(500/10.61)
        =-90-arctan50-arctan5-arctan1333.333333-arctan5.892752+arctan166.666667+arctan47.125353
        =-90-1.550799-arctan5-arctan1333.333333-arctan5.892752+arctan166.666667+arctan47.125353
        =-90-1.550799-1.373401-arctan1333.333333-arctan5.892752+arctan166.666667+arctan47.125353
        =-90-1.550799-1.373401-1.570046-arctan5.892752+arctan166.666667+arctan47.125353
        =-90-1.550799-1.373401-1.570046-1.402698+arctan166.666667+arctan47.125353
        =-90-1.550799-1.373401-1.570046-1.402698+1.564796+arctan47.125353
        =-90-1.550799-1.373401-1.570046-1.402698+1.564796+1.54958
        =-91.550799-1.373401-1.570046-1.402698+1.564796+1.54958
        =-92.9242-1.570046-1.402698+1.564796+1.54958
        =-94.494246-1.402698+1.564796+1.54958
        =-95.896944+1.564796+1.54958
        =-94.332148+1.54958
        =-92.782568
    答案:-90-arctan(0.1*500)-arctan(0.01*500)-arctan(500/0.375)-arctan(500/84.85)+arctan(500/3)+arctan(500/10.61)=-92.782568
    注：弧度制

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