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-arctan0.1×20-arctan0.01×20-arctan(1/0.375)*20-arctan(1/84.85)*20+arctan(1/3)*20+arctan(1/10.61)*20 的值.
    题型：数学计算
    解:
          -90-arctan0.1×20-arctan0.01×20-arctan(1/0.375)*20-arctan(1/84.85)*20+arctan(1/3)*20+arctan(1/10.61)*20
        =-90-arctan0.1×20-arctan0.01×20-arctan2.666667*20-arctan(1/84.85)*20+arctan(1/3)*20+arctan(1/10.61)*20
        =-90-arctan0.1×20-arctan0.01×20-arctan2.666667*20-arctan0.011786*20+arctan(1/3)*20+arctan(1/10.61)*20
        =-90-arctan0.1×20-arctan0.01×20-arctan2.666667*20-arctan0.011786*20+arctan0.333333*20+arctan(1/10.61)*20
        =-90-arctan0.1×20-arctan0.01×20-arctan2.666667*20-arctan0.011786*20+arctan0.333333*20+arctan0.094251*20
        =-90-0.099669×20-arctan0.01×20-arctan2.666667*20-arctan0.011786*20+arctan0.333333*20+arctan0.094251*20
        =-90-0.099669×20-0.01×20-arctan2.666667*20-arctan0.011786*20+arctan0.333333*20+arctan0.094251*20
        =-90-0.099669×20-0.01×20-1.212026*20-arctan0.011786*20+arctan0.333333*20+arctan0.094251*20
        =-90-0.099669×20-0.01×20-1.212026*20-0.011785*20+arctan0.333333*20+arctan0.094251*20
        =-90-0.099669×20-0.01×20-1.212026*20-0.011785*20+0.32175*20+arctan0.094251*20
        =-90-0.099669×20-0.01×20-1.212026*20-0.011785*20+0.32175*20+0.093973*20
        =-90-1.99338-0.01×20-1.212026*20-0.011785*20+0.32175*20+0.093973*20
        =-90-1.99338-0.2-1.212026*20-0.011785*20+0.32175*20+0.093973*20
        =-90-1.99338-0.2-24.24052-0.011785*20+0.32175*20+0.093973*20
        =-90-1.99338-0.2-24.24052-0.2357+0.32175*20+0.093973*20
        =-90-1.99338-0.2-24.24052-0.2357+6.435+0.093973*20
        =-90-1.99338-0.2-24.24052-0.2357+6.435+1.87946
        =-91.99338-0.2-24.24052-0.2357+6.435+1.87946
        =-92.19338-24.24052-0.2357+6.435+1.87946
        =-116.4339-0.2357+6.435+1.87946
        =-116.6696+6.435+1.87946
        =-110.2346+1.87946
        =-108.35514
    答案:-90-arctan0.1×20-arctan0.01×20-arctan(1/0.375)*20-arctan(1/84.85)*20+arctan(1/3)*20+arctan(1/10.61)*20=-108.35514
    注：弧度制

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