5*25/9
    arccos(75/76)
    3*5/3
    10%/4
    10%/4
    125/27-5*25/9+3*5/3+5
    3+9-7*8/4 1=x+2
    1/6
    6-4
    arctan10
    arctan0.01
    arctan1
    {11}{8}
    lg2*lg50
    lg50
    lg2
    -1-1=
    e^(-0.18554)
    （40000*1.025+5000+10000+4000）/（30000+45000）*45000
    （40000*1.025+5000+10000+4000）/（30000+45000）*30000

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