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-arctan0.12×300-arctan0.02×300-arctan(1/0.205)*300-arctan(1/23.894)*300+arctan(1/1.3)*300+arctan(1/7.073)*300 的值.
    题型：数学计算
    解:
          -90-arctan0.12×300-arctan0.02×300-arctan(1/0.205)*300-arctan(1/23.894)*300+arctan(1/1.3)*300+arctan(1/7.073)*300
        =-90-arctan0.12×300-arctan0.02×300-arctan4.878049*300-arctan(1/23.894)*300+arctan(1/1.3)*300+arctan(1/7.073)*300
        =-90-arctan0.12×300-arctan0.02×300-arctan4.878049*300-arctan0.041852*300+arctan(1/1.3)*300+arctan(1/7.073)*300
        =-90-arctan0.12×300-arctan0.02×300-arctan4.878049*300-arctan0.041852*300+arctan0.769231*300+arctan(1/7.073)*300
        =-90-arctan0.12×300-arctan0.02×300-arctan4.878049*300-arctan0.041852*300+arctan0.769231*300+arctan0.141383*300
        =-90-0.119429×300-arctan0.02×300-arctan4.878049*300-arctan0.041852*300+arctan0.769231*300+arctan0.141383*300
        =-90-0.119429×300-0.019997×300-arctan4.878049*300-arctan0.041852*300+arctan0.769231*300+arctan0.141383*300
        =-90-0.119429×300-0.019997×300-1.368598*300-arctan0.041852*300+arctan0.769231*300+arctan0.141383*300
        =-90-0.119429×300-0.019997×300-1.368598*300-0.041828*300+arctan0.769231*300+arctan0.141383*300
        =-90-0.119429×300-0.019997×300-1.368598*300-0.041828*300+0.655696*300+arctan0.141383*300
        =-90-0.119429×300-0.019997×300-1.368598*300-0.041828*300+0.655696*300+0.140452*300
        =-90-35.8287-0.019997×300-1.368598*300-0.041828*300+0.655696*300+0.140452*300
        =-90-35.8287-5.9991-1.368598*300-0.041828*300+0.655696*300+0.140452*300
        =-90-35.8287-5.9991-410.5794-0.041828*300+0.655696*300+0.140452*300
        =-90-35.8287-5.9991-410.5794-12.5484+0.655696*300+0.140452*300
        =-90-35.8287-5.9991-410.5794-12.5484+196.7088+0.140452*300
        =-90-35.8287-5.9991-410.5794-12.5484+196.7088+42.1356
        =-125.8287-5.9991-410.5794-12.5484+196.7088+42.1356
        =-131.8278-410.5794-12.5484+196.7088+42.1356
        =-542.4072-12.5484+196.7088+42.1356
        =-554.9556+196.7088+42.1356
        =-358.2468+42.1356
        =-316.1112
    答案:-90-arctan0.12×300-arctan0.02×300-arctan(1/0.205)*300-arctan(1/23.894)*300+arctan(1/1.3)*300+arctan(1/7.073)*300=-316.1112
    注：弧度制

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