（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
    200000000*（427.37-2.66）-12000000000
    (725+700+1450 )/100+1=
    [(500-35×2)+(500-35×2)]×2+11.9×8=
    140000000*（476.04-2.56）-9500000000
    145000000*（438.625-2.55）-8200000000
    [(500-35×2)+(600-35×2)]×2+11.9×8=
    [(550-35×2)+(450-35×2)]×2+11.9×8=
    (5050-725-700-1450)/200-1=
    (725+700+1450)/100+1=
    (4.3+8+5+6+5.2+4.75)×11.7×4.5=
    2.1+4.5+0.65+0.7+3.2+2.2+3.62+0.75+0.7+0.7+1.75+0.6+0.5+0.6+0.9+0.6=

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