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*5)-arctan(0.2*5)-arctan(0.06*5)-arctan(12*5)+arctan(0.3*5)+arctan(2*5) 的值.
    题型：数学计算
    解:
          90-arctan(0.1*5)-arctan(0.2*5)-arctan(0.06*5)-arctan(12*5)+arctan(0.3*5)+arctan(2*5)
        =90-arctan0.5-arctan(0.2*5)-arctan(0.06*5)-arctan(12*5)+arctan(0.3*5)+arctan(2*5)
        =90-arctan0.5-arctan1-arctan(0.06*5)-arctan(12*5)+arctan(0.3*5)+arctan(2*5)
        =90-arctan0.5-arctan1-arctan0.3-arctan(12*5)+arctan(0.3*5)+arctan(2*5)
        =90-arctan0.5-arctan1-arctan0.3-arctan60+arctan(0.3*5)+arctan(2*5)
        =90-arctan0.5-arctan1-arctan0.3-arctan60+arctan1.5+arctan(2*5)
        =90-arctan0.5-arctan1-arctan0.3-arctan60+arctan1.5+arctan10
        =90-0.463648-arctan1-arctan0.3-arctan60+arctan1.5+arctan10
        =90-0.463648-0.785398-arctan0.3-arctan60+arctan1.5+arctan10
        =90-0.463648-0.785398-0.291457-arctan60+arctan1.5+arctan10
        =90-0.463648-0.785398-0.291457-1.554131+arctan1.5+arctan10
        =90-0.463648-0.785398-0.291457-1.554131+0.982794+arctan10
        =90-0.463648-0.785398-0.291457-1.554131+0.982794+1.471128
        =89.536352-0.785398-0.291457-1.554131+0.982794+1.471128
        =88.750954-0.291457-1.554131+0.982794+1.471128
        =88.459497-1.554131+0.982794+1.471128
        =86.905366+0.982794+1.471128
        =87.88816+1.471128
        =89.359288
    答案:90-arctan(0.1*5)-arctan(0.2*5)-arctan(0.06*5)-arctan(12*5)+arctan(0.3*5)+arctan(2*5)=89.359288
    注：弧度制

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