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(0.12×70)-arctan(0.02×70)-arctan(1/0.205×70)-arctan(1/23.894×70)+arctan(1/1.3×70)+arctan(1/7.073×70) 的值.
    题型：数学计算
    解:
          -90-arctan(0.12×70)-arctan(0.02×70)-arctan(1/0.205×70)-arctan(1/23.894×70)+arctan(1/1.3×70)+arctan(1/7.073×70)
        =-90-arctan8.4-arctan(0.02×70)-arctan(1/0.205×70)-arctan(1/23.894×70)+arctan(1/1.3×70)+arctan(1/7.073×70)
        =-90-arctan8.4-arctan1.4-arctan(1/0.205×70)-arctan(1/23.894×70)+arctan(1/1.3×70)+arctan(1/7.073×70)
        =-90-arctan8.4-arctan1.4-arctan341.46343-arctan(1/23.894×70)+arctan(1/1.3×70)+arctan(1/7.073×70)
        =-90-arctan8.4-arctan1.4-arctan341.46343-arctan2.92964+arctan(1/1.3×70)+arctan(1/7.073×70)
        =-90-arctan8.4-arctan1.4-arctan341.46343-arctan2.92964+arctan53.84617+arctan(1/7.073×70)
        =-90-arctan8.4-arctan1.4-arctan341.46343-arctan2.92964+arctan53.84617+arctan9.89681
        =-90-1.452306-arctan1.4-arctan341.46343-arctan2.92964+arctan53.84617+arctan9.89681
        =-90-1.452306-0.950547-arctan341.46343-arctan2.92964+arctan53.84617+arctan9.89681
        =-90-1.452306-0.950547-1.567868-arctan2.92964+arctan53.84617+arctan9.89681
        =-90-1.452306-0.950547-1.567868-1.241858+arctan53.84617+arctan9.89681
        =-90-1.452306-0.950547-1.567868-1.241858+1.552227+arctan9.89681
        =-90-1.452306-0.950547-1.567868-1.241858+1.552227+1.470095
        =-91.452306-0.950547-1.567868-1.241858+1.552227+1.470095
        =-92.402853-1.567868-1.241858+1.552227+1.470095
        =-93.970721-1.241858+1.552227+1.470095
        =-95.212579+1.552227+1.470095
        =-93.660352+1.470095
        =-92.190257
    答案:-90-arctan(0.12×70)-arctan(0.02×70)-arctan(1/0.205×70)-arctan(1/23.894×70)+arctan(1/1.3×70)+arctan(1/7.073×70)=-92.190257
    注：弧度制

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