7.36/5
    16*4.6
    1.575/2.04
    4200*500*75
    -2-3
    -2-(-3)
    -2(-3)
     (6.02*10*e23)/16.02*10*e10
    ((10+7.5)*15+7.5^2-1.5^2)*3.1415926
    ((10+7.5)*15+7.5^2-1.5^2)
    （6.02*10e23）/16.02*10e10
    ((10+7.5)*15+100+7.5^2-1.5^2)
    8.7*(71-64)/9.7=
    (20*20)/21=
    (20*25+20)/21=
    200000*25+10000*20=
    arcsin0.29
    27/0.023*(1-1/1.023^54)+1000/1.023^54=
    27/0.023*(1-1/1.023^52)+1000/1.023^52=
    4.6%/2=

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