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〖1/1算式〗
    作业：求算式 180-90-arctan(0.5*5.02)-arctan(0.1*5.02)-arctan(0.023*5.02)+arctan(0.23*5.02) 的值.
    题型：数学计算
    解:
          180-90-arctan(0.5*5.02)-arctan(0.1*5.02)-arctan(0.023*5.02)+arctan(0.23*5.02)
        =180-90-arctan2.51-arctan(0.1*5.02)-arctan(0.023*5.02)+arctan(0.23*5.02)
        =180-90-arctan2.51-arctan0.502-arctan(0.023*5.02)+arctan(0.23*5.02)
        =180-90-arctan2.51-arctan0.502-arctan0.11546+arctan(0.23*5.02)
        =180-90-arctan2.51-arctan0.502-arctan0.11546+arctan1.1546
        =180-90-1.191665-arctan0.502-arctan0.11546+arctan1.1546
        =180-90-1.191665-0.465246-arctan0.11546+arctan1.1546
        =180-90-1.191665-0.465246-0.114951+arctan1.1546
        =180-90-1.191665-0.465246-0.114951+0.857029
        =90-1.191665-0.465246-0.114951+0.857029
        =88.808335-0.465246-0.114951+0.857029
        =88.343089-0.114951+0.857029
        =88.228138+0.857029
        =89.085167
    答案:180-90-arctan(0.5*5.02)-arctan(0.1*5.02)-arctan(0.023*5.02)+arctan(0.23*5.02)=89.085167
    注：弧度制

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