2.11*27.814585 - 2.664
    1654-8544-46*8465-61-54/24156+116+51*1*21+921*5453
    4*7*5*4-22-4/21
    800-900
    1.47^（1/2）
    1.372^（1/2）
    1.372^2
    1.372^3
    ((2/2.4)*((1+0.2*4.6225)^(1/3)))*(1/2.15)
    582930^0.55*76.92 + 81 482930^0.55*76.92 + 81 682931^0.55*76.92 + 81 782932^0.55*76.92 + 81 382933^0.55*76.92 + 81 449034^0.55*76.92 + 81 482935^0.55*76.92 + 81 682936^0.55*76.92 + 81 562937^0.55*76.92 + 81 322938^0.55*76.92 + 81
     58900^0.55 68900^0.55
    582930^0.55
    (60+30+20+15+12）/5
    (30+20）/2
    (30+20+15）/3
    (30+20+15+12）/4
    (30+20+15+12+10）/5
    (60+30+20+15+12+10）/6
    10lg((10^2.7)+(10^5.38))
    2^1/2

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