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 90-2*arctan(314.320444/25)-arctan(314.320444)+arctan(314.320444/2) 的值.
    题型：数学计算
    解:
          90-2*arctan(314.320444/25)-arctan(314.320444)+arctan(314.320444/2)
        =90-2*arctan12.572818-arctan(314.320444)+arctan(314.320444/2)
        =90-2*arctan12.572818-arctan314.320444+arctan(314.320444/2)
        =90-2*arctan12.572818-arctan314.320444+arctan157.160222
        =90-2*1.491427-arctan314.320444+arctan157.160222
        =90-2*1.491427-1.567615+arctan157.160222
        =90-2*1.491427-1.567615+1.564433
        =90-2.982854-1.567615+1.564433
        =87.017146-1.567615+1.564433
        =85.449531+1.564433
        =87.013964
    答案:90-2*arctan(314.320444/25)-arctan(314.320444)+arctan(314.320444/2)=87.013964
    注：弧度制

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