C(10,5)
    tan37
    tan18.5
    5261.6+13.411*27
    0.5*6.28*[40*3.44+60*(27-3.44)]+0.7*0.8*3.14*{350+2.5*[(9.787*3.44/27+0.731*(27-3.44)/27)]*(27+2.56)}
    4√2×1/√3
    3-√3+（1/3）
    e3+1
    0-3-1/2+1/2+1/8
    6*3.14
    -5+25/6
    4*0.8*6-3.2^2/4*0.8
    3.2/1.6
    !(34)*10
    !(33)*10
    !(33)
    !(34)
    !(32)
    !(31)
    !(35)

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