109*3
    （45+62）*85+6
    66*5+4*5
    （54+64）*5+6
    2864.789024/1.799
    2864.789024/1.819
    2*cos10
    2*sin10
    arctan(3^0.5/21)
    12/0.6
    12/1.5
    8*cos30
    cos30*6
    sin30*6
    √0.6122448
    √0.612
    √0.6
     ((0.9*550)^11.75214698)/(233^11.75214698)
    ((0.9*550)^11.75214698)*1000000/(233^11.75214698)
    (3/lg(0.9/0.5)

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