35819.74/(298*8.314)
    (9/80)*0.01
    (42.8*42.8)/57.2
    0.728/1.272
    0.544/1.272
    0=0.35*e(16.6513-2940.46/(x-35.93))+0.65*e(16.2874-2945.47/(x-49.15))-65*7.502
    1.47*0.42
    1.57*0.42
    [2*10^(-3)]^2/[1*10^(-3)*0.25*10^(-3)]
    [2*10^(-3)]^2/[1*10^(-3)*0.2510^(-3)]
    2*10^(-3)/[1*10^(-3)*0.2510^(-3)]
    0.0269*8.314*373
    (0.027-0.0269)*8.314*373
    (0.035-0.0269)*8.314*373
    20%+20%=
    0.0025∧0.35×0.0025∧2.88
    0.0025÷27.12
    0.0025∧2.88
    0.0023÷0.9108
    0.0075÷3.33

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