e(-2.804967)
    125.60÷55.72
    1668-1102/1102
    arctan－0.34
    arctan2.94
    arctan1000
    arctan0.441
    arctan2.94
    30%*0.840+50%*0.889+20%*1.086=
    1/(1+0.03)=
    25/-5+10
    (1122+110)*(1.25+0.1)*1.6
    (1122+110)*1.1*2.5/2.4
    (1122+110)*1.1*1.25
    1200*4/2.3+800*2.5*4/2.3
    800*2.5*4/2.3
    54*62-53*63
    -18/-10
    -10/-10
    18/0.1

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