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(0.78*172.39*0.085)-arctan(0.2*0.78)-arctan(0.5*0.78)-arctan(0.78*172.39) 的值.
    题型：数学计算
    解:
          -90+arctan(0.78*172.39*0.085)-arctan(0.2*0.78)-arctan(0.5*0.78)-arctan(0.78*172.39)
        =-90+arctan11.429457-arctan(0.2*0.78)-arctan(0.5*0.78)-arctan(0.78*172.39)
        =-90+arctan11.429457-arctan0.156-arctan(0.5*0.78)-arctan(0.78*172.39)
        =-90+arctan11.429457-arctan0.156-arctan0.39-arctan(0.78*172.39)
        =-90+arctan11.429457-arctan0.156-arctan0.39-arctan134.4642
        =-90+1.483525-arctan0.156-arctan0.39-arctan134.4642
        =-90+1.483525-0.154753-arctan0.39-arctan134.4642
        =-90+1.483525-0.154753-0.371856-arctan134.4642
        =-90+1.483525-0.154753-0.371856-1.56336
        =-88.516475-0.154753-0.371856-1.56336
        =-88.671228-0.371856-1.56336
        =-89.043084-1.56336
        =-90.606444
    答案:-90+arctan(0.78*172.39*0.085)-arctan(0.2*0.78)-arctan(0.5*0.78)-arctan(0.78*172.39)=-90.606444
    注：弧度制

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