arctan4.5
    -lg0.001
    -lg0.1
    -lg0.01
    -lg10-3
    271801.000027/99990
    2/3÷3/1/2
    1/3÷3/0.5
    10*1.1^36=
    10lg(-20.14)=
    arctan2.65-arctan5.3
    256.44*1000/4.1/3600/0.51/0.51/3.14*4
    65.25*1000/15.8/3600/0.145/0.145/3.14*4
    208000/44.35/3600/0.169/0.169/3.14*4
    59000/44.35/3600/0.088/0.088/3.14*4
    5/6÷½=
    ln(1+√2)-(√2-1)
    60*（1-20%）
    6630/（1+2%）*6/13
    12357/70611

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