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*400)-arctan(0.01*400)-arctan(400/0.375)-arctan(400/84.85)+arctan(400/3)+arctan(400/10.61) 的值.
    题型：数学计算
    解:
          -90-arctan(0.1*400)-arctan(0.01*400)-arctan(400/0.375)-arctan(400/84.85)+arctan(400/3)+arctan(400/10.61)
        =-90-arctan40-arctan(0.01*400)-arctan(400/0.375)-arctan(400/84.85)+arctan(400/3)+arctan(400/10.61)
        =-90-arctan40-arctan4-arctan(400/0.375)-arctan(400/84.85)+arctan(400/3)+arctan(400/10.61)
        =-90-arctan40-arctan4-arctan1066.666667-arctan(400/84.85)+arctan(400/3)+arctan(400/10.61)
        =-90-arctan40-arctan4-arctan1066.666667-arctan4.714202+arctan(400/3)+arctan(400/10.61)
        =-90-arctan40-arctan4-arctan1066.666667-arctan4.714202+arctan133.333333+arctan(400/10.61)
        =-90-arctan40-arctan4-arctan1066.666667-arctan4.714202+arctan133.333333+arctan37.700283
        =-90-1.545802-arctan4-arctan1066.666667-arctan4.714202+arctan133.333333+arctan37.700283
        =-90-1.545802-1.325818-arctan1066.666667-arctan4.714202+arctan133.333333+arctan37.700283
        =-90-1.545802-1.325818-1.569859-arctan4.714202+arctan133.333333+arctan37.700283
        =-90-1.545802-1.325818-1.569859-1.36177+arctan133.333333+arctan37.700283
        =-90-1.545802-1.325818-1.569859-1.36177+1.563296+arctan37.700283
        =-90-1.545802-1.325818-1.569859-1.36177+1.563296+1.544278
        =-91.545802-1.325818-1.569859-1.36177+1.563296+1.544278
        =-92.87162-1.569859-1.36177+1.563296+1.544278
        =-94.441479-1.36177+1.563296+1.544278
        =-95.803249+1.563296+1.544278
        =-94.239953+1.544278
        =-92.695675
    答案:-90-arctan(0.1*400)-arctan(0.01*400)-arctan(400/0.375)-arctan(400/84.85)+arctan(400/3)+arctan(400/10.61)=-92.695675
    注：弧度制

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