2-0.736-0.736
    5.018-2.838
    5.018+1+1.838
    1.838*2
    8+2.036-4
    0.018*8
    90-arctan(sqrt(5))-arctan(sqrt(5)/5)
    arctan-1.645
    arctan2.256875
    (70.71%/100)*0.3535
    （70.71%100）*03535
    (70.71%/100)*0.7071
    193.6*193.6/484
    0.4*484
    220*220/100
    12*1.5
    220*220/1000
    tan1.8
    tan-（0.9/0.5）
    160/(1+10%)+110/(1+10%)^2+160/(1+10%)^3+40/(1+10%)^4

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