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    (49211300000-56629000000)/56629000000
    (1550+100-20×2+15×18×2)×2×5+(6000+400+3700+250+1000-20×2+15×20×2)
    (5000+500+100-20×2+15×20×2)×3×5+(8000-20×2+15×20×2)×4×5
    200000000*(388.52-2.93)-12000000000
    (1550+100-20×2+15×18×2)×2×5+(4700+400+500-20×2+15×20×2)×3×5
    140000000*(432.76-2.82)-9500000000
    145000000*(398.75-2.81)-8200000000
    [(300-20×2) +(600-20×2)×2+11.9×8=
    {[(900-50)/100+1]×2×2×2×2×2+[(1550-400-50)/100+1]×2}×5=
    [(250-20×2) +(600-20×2)]×2+11.9×8=
    (72942000000-65172000000)/65172000000
    (56787200000-50728000000)/50728000000
    [(650+700+650)/100+1]×2×5=
    (55030875000-56629000000)/56629000000=
    [(3900-650-700-650)/200-1]×2×5=
    [(5050-725-700-1450)/200-1]×3=
    [(725+700+1450)/100+1]×3=
    [(5050-725-700-1450)/200-1]×2=
    [(725+700+1450)/100+1]×2=
    5/9+2/3-2/5

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