(399+3428)×1.3/30-8000/30×2
    (358×0.5)/117+0.3
    (340×0.5)/117+0.3
    (4556+3428)×1.3/30
    (7836+399)×1.3/30
    4556×1.3/30
    7836×1.3/30
    {8832×1.3/30,2932×1.3/30}
    {7836×1.3/30,2932×1.3/30}
    16109+4975
    (399+3428)×1.3
    (7836+4556)×1.3
    1350*0.333
    10.46+253.13
    1012.5*0.25
    337.5*1.222
    337.5*0.031
    C(10,5)
    tan37
    tan18.5

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