tan20/cos13
    arctan0.37
    tan20/cos13
    cos14
    cos15
    sin150
    -14-（-2）+0.5*0.5
    0.83^0.67
    0.75^0.67
    0.8^1.2
    1.5^0.3
    4400÷2.2+4400
    （120+96）÷27
    72÷0.6
    9000÷1.2
     168*31.1*0.01*4.83+84*31.1*0.01*3.85+448*31.1*0.01*0.888+168*82.8*0.01*4.83+69.6*82.8*0.01*3.85+448*82.8*0.01*0.888
    120*38.1*0.01*4.83+60*38.1*0.01*3.85+320*38.1*0.01*0.888+120*77.2*0.01*4.83+60*77.2*0.01*3.85+320*77.2*0.01*0.888
    8964-2
    (15264-2237-545-410-450-250)/2
    15264-2237-545-410-450-250

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