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    (500*(1-0.2)-100*0.2)*(1-0.4)/(1200-(500*(1-0.2)-100*0.2)*(1-0.4))
    3÷(9/10)
    acos(0.5)
    1350*ln(310/468)-770*150^2/(468^2-150^2)*(310^2-468^2)/310^2
    1+1
    [1-9/(9+5.84)×(1-5%)]×100%
    [1-9/(9+0)×(1-5%)]×100%
    [1-9/(9+5.84)×(1-20%)]×100%
    [1-9/(9+0)×(1-20%)]×100%
    [1-9/(9+5.84)×(1-0)]×100%
    [1-8/(8+0)×(1-0)]×100%
    5*58-48/5552
    150*1175/214*ln((468^2-150^2)/(440^2-150^2))
    150*1170/214*ln((440^2-150^2)/(414^2-150^2))
    150*1170/214*ln((414^2-150^2)/(388^2-150^2))
    150*1175/214*ln((388^2-150^2)/(362^2-150^2))
    150*1210/214*ln((336^2-150^2)/(310^2-150^2))
    150*1185/214*ln((362^2-150^2)/(336^2-150^2))
    150*1210/214*ln((336^2-150^2)/(310^2-150^2))
    (1188.75+23.78+26.09)×5%

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