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    4300+4700+5000+6000+3700-350-250-35×12=
    [(250-20×2)+(700-20×2)]×2+11.9×8=
    (4700-750×2+6000-750×2+3700-750×2+8000+5000-1050×4)/200-1=
    [(750-50)/100+1]×6+[(1050-50)/100+1]×4
    (8844,4855)-(4858,1235)
    [(8000-1000)/3×2+500]×4+(5000-400)/3×2+500=
    4300+4700+8000+5000+6000+3700-500+1000-35×2+15×20×2=
    4300-250-400+1000-35+4700+8000+5000-500×3+500×4-35×4=
    [(250-20)×2+(500-20×2)]×2+11.9×10
    (4300+4700+8000+5000-500×3-400-250-1050×8)/200-1
    [(1050-50)/100+1]×8=
    [(8000-1000)/3×2+500]×2+[(4700-100)/3×2+500]×2=
    [(4300-250-400)/3+450-35+15×20+(5000-400)/3+500-35+15×20]×2
    (4300+4700+5000+8000-250-400+950-35×2+15×20×2)×2
    [(250-20×2)+(600-20×2)]×2+11.9×8
    (5000+6700-350-500-275-750×2)/200-1
    (6700-500+1000-35×2+15×18×2)×3+(5000-800+1000-35×2+15×18×2)×3
    [(6700-500)/3]×2+500
    [(6700-500)/3+500-35+15×20×2]×2+[(5000-800)/3+500-35×2×15×18]×2
    0.3842811/9*2.4+(2/9*1.102^3-2/9*0.727^3)*2.2

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