1-[(8/18) ²+0+(3/18) ²+(1/18) ²+(2/18) ²+(4/18) ²]
    -90-arctan(0.12×34.6)-arctan(0.02×34.6)-arctan(34.6/0.205)-arctan(34.6/23.894)+arctan(34.6/1.3)+arctan(34.6/7.073)
    tan(arccos0.896)-tan(arccos0.92)
    648×1.0688×（1+0.00523）×1.312×0.8636+5
    90-arctan0.025-arctan0.00835
    sin30
    cos60
    -90-arctan10-arctan3.3333
    -90-arctan7.5-arctan2.5
    -90-arctan0.025-arctan0.0083
    20lg0.05-20lg90-20lg45-20lg15
    86+2.5×1.3+0.3*7+4.2*7/1-35%-15%
    88+2.5×1.3+0.3*7+4.2*7/1-35%-15%
    17+17/70
    14126772×1.02^250
    100000×1.02^250
    100000×（1.02）²
    100/1.02=
    1/9-1/3-1
    2^3

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