cos-1/2
    7-(-5)
    2.4×3.5+6.5÷1.3
    1.84÷2.3×0.65
    18÷0.36÷0.25
    2+9
    e6000
    ln2
    e^2/4
    (19/14-4/7-3/10)*70
    3/11*14+19*3/11
    16/5*11/4-5/12*3.2+25/6*16/5-3/2*16/5
    (7/6+2/5+7/15)*30
    (7/6+2/5+7/15)*30
    6/7*8/3+6/7*13/3
    37/7/15+2+1/7*27-43*15/7
    (1+5/14-4/7-3/10)*70
    7/9*32-14*7/9
    2+3/7*2+1/2+(10/3)/(17/7)+17/7*1+1/6
    （11/14+3/7+13/21）*42

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