(6×31)/((31+1)×(31+2))×14.9/18.5
    18.5/0.6
    1/2×10×10×0.22+10×0.39
    0.9×1.2×0.36
    ln6
    1+2
    1×1.2×0.3
    1.0×0.8×0.3
    1.0×0.96×0.3
    1.2×0.14/(0.9×1.5)
    (0.9+1.5+0.325×0.9×1.5)×0.048
    ln2
    200+198+196+....+0
    (19500×533.26-1300×(533.26-90.04))/19500
    19500/2×(154.37-90.04)/(533.26-90.04)
    (154.37-90.04)/(533.26-90.04)
    19500/2×(154.37-60)/(300-60)
    0.50×〖10〗^(-3)×1.39×180×1250
    0.50×〖10〗^(-3)×1.39×180×1234
    13.8×1500×797×(1234-79/2)

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