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           ☆算术计算1题

〖1/1算式〗
    作业：求算式 -90-arctan(0.1*2)-arctan(0.01*2)-arctan(2/0.375)-arctan(2/84.85)+arctan(2/3)+arctan(2/10.61) 的值.
    题型：数学计算
    解:
          -90-arctan(0.1*2)-arctan(0.01*2)-arctan(2/0.375)-arctan(2/84.85)+arctan(2/3)+arctan(2/10.61)
        =-90-arctan0.2-arctan(0.01*2)-arctan(2/0.375)-arctan(2/84.85)+arctan(2/3)+arctan(2/10.61)
        =-90-arctan0.2-arctan0.02-arctan(2/0.375)-arctan(2/84.85)+arctan(2/3)+arctan(2/10.61)
        =-90-arctan0.2-arctan0.02-arctan5.333333-arctan(2/84.85)+arctan(2/3)+arctan(2/10.61)
        =-90-arctan0.2-arctan0.02-arctan5.333333-arctan0.023571+arctan(2/3)+arctan(2/10.61)
        =-90-arctan0.2-arctan0.02-arctan5.333333-arctan0.023571+arctan0.666667+arctan(2/10.61)
        =-90-arctan0.2-arctan0.02-arctan5.333333-arctan0.023571+arctan0.666667+arctan0.188501
        =-90-0.197396-arctan0.02-arctan5.333333-arctan0.023571+arctan0.666667+arctan0.188501
        =-90-0.197396-0.019997-arctan5.333333-arctan0.023571+arctan0.666667+arctan0.188501
        =-90-0.197396-0.019997-1.385448-arctan0.023571+arctan0.666667+arctan0.188501
        =-90-0.197396-0.019997-1.385448-0.023567+arctan0.666667+arctan0.188501
        =-90-0.197396-0.019997-1.385448-0.023567+0.588003+arctan0.188501
        =-90-0.197396-0.019997-1.385448-0.023567+0.588003+0.186315
        =-90.197396-0.019997-1.385448-0.023567+0.588003+0.186315
        =-90.217393-1.385448-0.023567+0.588003+0.186315
        =-91.602841-0.023567+0.588003+0.186315
        =-91.626408+0.588003+0.186315
        =-91.038405+0.186315
        =-90.85209
    答案:-90-arctan(0.1*2)-arctan(0.01*2)-arctan(2/0.375)-arctan(2/84.85)+arctan(2/3)+arctan(2/10.61)=-90.85209
    注：弧度制

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