tan（arccos0.86)-tan（arccos0.92）
    (tanarccos0.7-tanarccos0.9)
    (tanarccos0.87-tanarccos0.93)
    sqrt(e)+(e)
    sqrt(e)+e
    120/（0.634/0.025-0.5）
    120/（0.634/0.025-0.5）
    1/5857*0.3157/0.0283+0.0005/393*0.3157/0.0298+0.0001+0.004+1/40.46/0.884
    2607*（40-36）^0.5716
    0.96*0.2182*1670^(0.5716)*18.4^(-0.15)*1.1*1.2*0.0108/0.0033
    10－(2.7+3.1)×1.5
    0.96*0.2182*1670^(0.5716)*18.4^(-0.15)*1.1*1.2*0.0108/0.0033
    0.96*0.2182*1670^(0.5671)*18.4^(-0.15)*1.1*1.2
    0.96*0.2182*1670^(-0.15)*18.4^(-0.15)*1.1*1.2
    0.96*0.2182*1670^（-1.5）*18.4^（-1.5）*1.1*1.2
    2202-181.82-21.82-1.10-24.63-40.20-3.96=
    2202×5÷10000
    181.82×（7%＋3%＋2%）
    2202÷1.09×9%
    （329.66+330.96）/2

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