-90-arctan0.1×5-arctan0.01×5-arctan(1/0.375)5-arctan(1/84.85)5＋arctan(1/3)5＋arctan(1/10.61)5=
    -90-arctan0.1×3-arctan0.01×3-arctan(1/0.375)3-arctan(1/84.85)3＋arctan(1/3)3＋arctan(1/10.61)3=
    -90-arctan0.1×1-arctan0.01×1-arctan(1/0.375)-arctan(1/84.85)＋arctan(1/3)＋arctan(1/10.61)=
    -90-arctan0.1×0.8-arctan0.01×0.8-arctan(1/0.375)0.8-arctan(1/84.85)0.8＋arctan(1/3)0.8＋arctan(1/10.61)0.8=
    -90-arctan0.1×0.7-arctan0.01×0.7-arctan(1/0.375)0.7-arctan(1/84.85)0.7＋arctan(1/3)0.7＋arctan(1/10.61)0.7=
    -90-arctan0.1×0.5-arctan0.01×0.5-arctan(1/0.375)0.5-arctan(1/84.85)0.5＋arctan(1/3)0.5＋arctan(1/10.61)0.5 =
    -90-arctan0.1×0.375-arctan0.01×0.375-arctan(1/0.375)0.375-arctan(1/84.85)0.375＋arctan(1/3)0.375＋arctan(1/10.61)0.375 =
    -90-arctan0.1×0.1-arctan0.001-arctan(1/0.375)0.1-arctan(1/84.85)0.1＋arctan(1/3)0.1＋arctan(1/10.61)0.1 =
    20lg180-20lg100-20lg50-20lg16.667
     （250×√((98.07÷3)^2＋1)×√((98.07÷10.61)^2＋1))÷(98.07×√（9.807^2＋1）×√（0.9807^2＋1）×√（(98.07÷0.375)^2＋1）×√（(98.07÷84.85)^2＋1）) =
    √2
    lg10
    -90-arctan35-arctan3.5
    -90-arctan 35-arctan 3.5
    -90-arctan 35-arctan 3.5
    0.02/(1000((0.01*1000^2+1)(0.0001*1000^2+1))^0.5)
    0.02/(800((0.01*800^2+1)(0.0001*800^2+1))^0.5)
    0.02/(500((0.01*500^2+1)(0.0001*500^2+1))^0.5)
    0.02/(300((0.01*300^2+1)(0.0001*300^2+1))^0.5)
    0.02/(200((0.01*200^2+1)(0.0001*200^2+1))^0.5)

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