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           ☆算术计算1题

〖1/1算式〗
    作业：求算式 -90-arctan0.1×30-arctan0.01×30-arctan(1/0.375)*30-arctan(1/84.85)*30+arctan(1/3)*30+arctan(1/10.61)*30 的值.
    题型：数学计算
    解:
          -90-arctan0.1×30-arctan0.01×30-arctan(1/0.375)*30-arctan(1/84.85)*30+arctan(1/3)*30+arctan(1/10.61)*30
        =-90-arctan0.1×30-arctan0.01×30-arctan2.666667*30-arctan(1/84.85)*30+arctan(1/3)*30+arctan(1/10.61)*30
        =-90-arctan0.1×30-arctan0.01×30-arctan2.666667*30-arctan0.011786*30+arctan(1/3)*30+arctan(1/10.61)*30
        =-90-arctan0.1×30-arctan0.01×30-arctan2.666667*30-arctan0.011786*30+arctan0.333333*30+arctan(1/10.61)*30
        =-90-arctan0.1×30-arctan0.01×30-arctan2.666667*30-arctan0.011786*30+arctan0.333333*30+arctan0.094251*30
        =-90-0.099669×30-arctan0.01×30-arctan2.666667*30-arctan0.011786*30+arctan0.333333*30+arctan0.094251*30
        =-90-0.099669×30-0.01×30-arctan2.666667*30-arctan0.011786*30+arctan0.333333*30+arctan0.094251*30
        =-90-0.099669×30-0.01×30-1.212026*30-arctan0.011786*30+arctan0.333333*30+arctan0.094251*30
        =-90-0.099669×30-0.01×30-1.212026*30-0.011785*30+arctan0.333333*30+arctan0.094251*30
        =-90-0.099669×30-0.01×30-1.212026*30-0.011785*30+0.32175*30+arctan0.094251*30
        =-90-0.099669×30-0.01×30-1.212026*30-0.011785*30+0.32175*30+0.093973*30
        =-90-2.99007-0.01×30-1.212026*30-0.011785*30+0.32175*30+0.093973*30
        =-90-2.99007-0.3-1.212026*30-0.011785*30+0.32175*30+0.093973*30
        =-90-2.99007-0.3-36.36078-0.011785*30+0.32175*30+0.093973*30
        =-90-2.99007-0.3-36.36078-0.35355+0.32175*30+0.093973*30
        =-90-2.99007-0.3-36.36078-0.35355+9.6525+0.093973*30
        =-90-2.99007-0.3-36.36078-0.35355+9.6525+2.81919
        =-92.99007-0.3-36.36078-0.35355+9.6525+2.81919
        =-93.29007-36.36078-0.35355+9.6525+2.81919
        =-129.65085-0.35355+9.6525+2.81919
        =-130.0044+9.6525+2.81919
        =-120.3519+2.81919
        =-117.53271
    答案:-90-arctan0.1×30-arctan0.01×30-arctan(1/0.375)*30-arctan(1/84.85)*30+arctan(1/3)*30+arctan(1/10.61)*30=-117.53271
    注：弧度制

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