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(7.5)-arctan(0.035*7.5)+arctan(0.5*7.5) 的值.
    题型：数学计算
    解:
          -90-arctan(7.5)-arctan(0.035*7.5)+arctan(0.5*7.5)
        =-90-arctan7.5-arctan(0.035*7.5)+arctan(0.5*7.5)
        =-90-arctan7.5-arctan0.2625+arctan(0.5*7.5)
        =-90-arctan7.5-arctan0.2625+arctan3.75
        =-90-1.438245-arctan0.2625+arctan3.75
        =-90-1.438245-0.256708+arctan3.75
        =-90-1.438245-0.256708+1.310194
        =-91.438245-0.256708+1.310194
        =-91.694953+1.310194
        =-90.384759
    答案:-90-arctan(7.5)-arctan(0.035*7.5)+arctan(0.5*7.5)=-90.384759
    注：弧度制

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