((1 - 2.1)^2 + (3 - 2.1)^2 + (3 - 2.1)^2 + (2 - 2.1)^2 + (1.5 - 2.1)^2) / (5 - 1)
    (1 + 3 + 3 + 2 + 1.5) / 5
    14.5/5
    (2 + 1 + 3 + 3 + 4.5) / 5
    10 / (50.7 + 60)
    5.6×1.9
    1/(0.05+0.13) + 1/(0.15+0.13) + 1/(0.05+0.15+0.13)
    282164/70.68
    81048+201116
    15701/4.8%×（1-1/（1+4.8%）^48)×(1/(1+4.8%)^8)
    11087/(4.8%-3.5%)×(1-(1+3.5%)^8/(1+4.8%)^8)
    1＋1.1＋1.2＋1.3＋1.4＋1.5＋1.6＋1.7＋1.8＋1.9＋2 (9＋8.1＋7.11＋6.111＋5.1111＋4.11111＋3.111111)÷21.06172835 98765.4321×1234.56789－98765.4322×1234.56788
    272010÷70.68
    10667/(4.8%-3.5%)×(1-(1+3.5%)^8/(1+4.8%)^8)
    66485/(（1+6%）^7)=
    886473*(13/52)*(3/10)=
    1.643/2
    15*42000*（1+5%）^7=
    420*[tan(arccos0.77)-tan(arccos0.92)]
    650*[tan(arccos0.77)-tan(arccos0.92)]

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