28773/1+7.6%
    (2+50sqrt(7))/27
    (87-29sqrt(29))/27
    -244.8685*-1.9*170
    -244.8685*-1.9+170
    sqrt(((5-sqrt(3))/4)^2+((5+sqrt(3))/4)^2)
    e-0.015
    1+√3
    1/4×（5+4）×18÷2=
    36÷54×32×21=
    (42769/11484)^(1/5)
    80^(0.1)
    0.6*ln10000+0.4*ln4000
    0.6*ln12000+0.4*ln4000
    15×82÷61×17×2=
    61×32÷5% =
    61×32÷5 =
    （1450-1200）5%÷16=
    132×15÷61×20÷4=
    81÷13×72×1/5=

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