arctan(10)
    8.844332776^0.5
    acos1
    √456-56=
    √45
    √5-2=
    √4^
    2^π
    -2÷4=
    -6.83×（-6.83×0.5+1）/（（0.25×（-6.83）+1）
    5/3-4/4+10/-2
    435943.27/（1+6%）*6.72%
    4.61*10^9*1.015^50
    10685126480+3.98*10^8*1.005^50*6290*1.025^50*0.0004837+4.61*10^9*1.015^50*3530*1.030^50*0.0004837
    0.0004837-0.0001790=
    3/4/0.024
    [41508.33×(1-20%)×(1-25%)-5000]×3%=
    [40000×(1-20%)×(1-25%)-5000]×3%=
    (-0.5)^(1/5)
    !(50)=

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