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 arctan(66/(-0.2*88+1))-arctan(66/(-0.02*88+1))-arctan(-90*1.732/65)-arctan(-90*1.732/115) 的值.
    题型：数学计算
    解:
          arctan(66/(-0.2*88+1))-arctan(66/(-0.02*88+1))-arctan(-90*1.732/65)-arctan(-90*1.732/115)
        =arctan(66/(-16.6))-arctan(66/(-0.02*88+1))-arctan(-90*1.732/65)-arctan(-90*1.732/115)
        =arctan(-3.975904)-arctan(66/(-0.02*88+1))-arctan(-90*1.732/65)-arctan(-90*1.732/115)
        =arctan-3.975904-arctan(66/(-0.76))-arctan(-90*1.732/65)-arctan(-90*1.732/115)
        =arctan-3.975904-arctan(-86.842105)-arctan(-90*1.732/65)-arctan(-90*1.732/115)
        =arctan-3.975904-arctan-86.842105-arctan(-2.398154)-arctan(-90*1.732/115)
        =arctan-3.975904-arctan-86.842105-arctan-2.398154-arctan(-1.355478)
        =-1.324392-arctan-86.842105-arctan-2.398154-arctan-1.355478
        =-1.324392--1.559282-arctan-2.398154-arctan-1.355478
        =-1.324392--1.559282--1.175732-arctan-1.355478
        =-1.324392--1.559282--1.175732--0.935183
        =0.23489-(-1.175732)-(-0.935183)
        =1.410622-(-0.935183)
        =2.345805
    答案:arctan(66/(-0.2*88+1))-arctan(66/(-0.02*88+1))-arctan(-90*1.732/65)-arctan(-90*1.732/115)=2.345805
    注：弧度制

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