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           ☆算术计算1题

〖1/1算式〗
    作业：求算式 180-90-arctan(0.5*7.56)-arctan(0.1*7.56)-arctan(0.023*7.56)+arctan(0.23*7.56) 的值.
    题型：数学计算
    解:
          180-90-arctan(0.5*7.56)-arctan(0.1*7.56)-arctan(0.023*7.56)+arctan(0.23*7.56)
        =180-90-arctan3.78-arctan(0.1*7.56)-arctan(0.023*7.56)+arctan(0.23*7.56)
        =180-90-arctan3.78-arctan0.756-arctan(0.023*7.56)+arctan(0.23*7.56)
        =180-90-arctan3.78-arctan0.756-arctan0.17388+arctan(0.23*7.56)
        =180-90-arctan3.78-arctan0.756-arctan0.17388+arctan1.7388
        =180-90-1.312171-arctan0.756-arctan0.17388+arctan1.7388
        =180-90-1.312171-0.64733-arctan0.17388+arctan1.7388
        =180-90-1.312171-0.64733-0.172159+arctan1.7388
        =180-90-1.312171-0.64733-0.172159+1.04888
        =90-1.312171-0.64733-0.172159+1.04888
        =88.687829-0.64733-0.172159+1.04888
        =88.040499-0.172159+1.04888
        =87.86834+1.04888
        =88.91722
    答案:180-90-arctan(0.5*7.56)-arctan(0.1*7.56)-arctan(0.023*7.56)+arctan(0.23*7.56)=88.91722
    注：弧度制

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