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(0.12×0.1)-arctan(0.02×0.1)-arctan(1/0.205×0.1)-arctan(1/23.894×0.1)+arctan(1/1.3×0.1)+arctan(1/7.073×0.1) 的值.
    题型：数学计算
    解:
          -90-arctan(0.12×0.1)-arctan(0.02×0.1)-arctan(1/0.205×0.1)-arctan(1/23.894×0.1)+arctan(1/1.3×0.1)+arctan(1/7.073×0.1)
        =-90-arctan0.012-arctan(0.02×0.1)-arctan(1/0.205×0.1)-arctan(1/23.894×0.1)+arctan(1/1.3×0.1)+arctan(1/7.073×0.1)
        =-90-arctan0.012-arctan0.002-arctan(1/0.205×0.1)-arctan(1/23.894×0.1)+arctan(1/1.3×0.1)+arctan(1/7.073×0.1)
        =-90-arctan0.012-arctan0.002-arctan0.487805-arctan(1/23.894×0.1)+arctan(1/1.3×0.1)+arctan(1/7.073×0.1)
        =-90-arctan0.012-arctan0.002-arctan0.487805-arctan0.004185+arctan(1/1.3×0.1)+arctan(1/7.073×0.1)
        =-90-arctan0.012-arctan0.002-arctan0.487805-arctan0.004185+arctan0.076923+arctan(1/7.073×0.1)
        =-90-arctan0.012-arctan0.002-arctan0.487805-arctan0.004185+arctan0.076923+arctan0.014138
        =-90-0.011999-arctan0.002-arctan0.487805-arctan0.004185+arctan0.076923+arctan0.014138
        =-90-0.011999-0.002-arctan0.487805-arctan0.004185+arctan0.076923+arctan0.014138
        =-90-0.011999-0.002-0.453844-arctan0.004185+arctan0.076923+arctan0.014138
        =-90-0.011999-0.002-0.453844-0.004185+arctan0.076923+arctan0.014138
        =-90-0.011999-0.002-0.453844-0.004185+0.076772+arctan0.014138
        =-90-0.011999-0.002-0.453844-0.004185+0.076772+0.014137
        =-90.011999-0.002-0.453844-0.004185+0.076772+0.014137
        =-90.013999-0.453844-0.004185+0.076772+0.014137
        =-90.467843-0.004185+0.076772+0.014137
        =-90.472028+0.076772+0.014137
        =-90.395256+0.014137
        =-90.381119
    答案:-90-arctan(0.12×0.1)-arctan(0.02×0.1)-arctan(1/0.205×0.1)-arctan(1/23.894×0.1)+arctan(1/1.3×0.1)+arctan(1/7.073×0.1)=-90.381119
    注：弧度制

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