2600/81.62
    9.752-7.269
    (104.5×10^3)/(0.996×3555.5×215)+(0.85×4.1×10^6)/(1.05×236865.58×(1-(0.8×104.5)/131472.87)×215)
    (π^2×2.06×10^5×3555.5)/(1.1×〖7.07〗^2 )
    577/81.62
    4.427-4.059
    7*lg1000-6
    7*lg2100-6
    7*lg2300-6
    0.125*0.2
    e(-250176.4/8.314/398)
    503*19880715705765
    503*198807157058
    1/60437
    1/97
    1/983
    1/989
    1/9397
    707*1414427157001414427157
    86×9.99＋172×6.25-23×4.92+5

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