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(0.1*0.2)-arctan(0.01*0.2)-arctan(0.2/0.375)-arctan(0.2/84.85)+arctan(0.2/3)+arctan(0.2/10.61) 的值.
    题型：数学计算
    解:
          -90-arctan(0.1*0.2)-arctan(0.01*0.2)-arctan(0.2/0.375)-arctan(0.2/84.85)+arctan(0.2/3)+arctan(0.2/10.61)
        =-90-arctan0.02-arctan(0.01*0.2)-arctan(0.2/0.375)-arctan(0.2/84.85)+arctan(0.2/3)+arctan(0.2/10.61)
        =-90-arctan0.02-arctan0.002-arctan(0.2/0.375)-arctan(0.2/84.85)+arctan(0.2/3)+arctan(0.2/10.61)
        =-90-arctan0.02-arctan0.002-arctan0.533333-arctan(0.2/84.85)+arctan(0.2/3)+arctan(0.2/10.61)
        =-90-arctan0.02-arctan0.002-arctan0.533333-arctan0.002357+arctan(0.2/3)+arctan(0.2/10.61)
        =-90-arctan0.02-arctan0.002-arctan0.533333-arctan0.002357+arctan0.066667+arctan(0.2/10.61)
        =-90-arctan0.02-arctan0.002-arctan0.533333-arctan0.002357+arctan0.066667+arctan0.01885
        =-90-0.019997-arctan0.002-arctan0.533333-arctan0.002357+arctan0.066667+arctan0.01885
        =-90-0.019997-0.002-arctan0.533333-arctan0.002357+arctan0.066667+arctan0.01885
        =-90-0.019997-0.002-0.489957-arctan0.002357+arctan0.066667+arctan0.01885
        =-90-0.019997-0.002-0.489957-0.002357+arctan0.066667+arctan0.01885
        =-90-0.019997-0.002-0.489957-0.002357+0.066568+arctan0.01885
        =-90-0.019997-0.002-0.489957-0.002357+0.066568+0.018848
        =-90.019997-0.002-0.489957-0.002357+0.066568+0.018848
        =-90.021997-0.489957-0.002357+0.066568+0.018848
        =-90.511954-0.002357+0.066568+0.018848
        =-90.514311+0.066568+0.018848
        =-90.447743+0.018848
        =-90.428895
    答案:-90-arctan(0.1*0.2)-arctan(0.01*0.2)-arctan(0.2/0.375)-arctan(0.2/84.85)+arctan(0.2/3)+arctan(0.2/10.61)=-90.428895
    注：弧度制

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