sin45
    tan10.2
    47➗34
    23➗7
    1234.00×［1-1/（1+8.0%）^21.05］
    9717.00×80%+3731.00×20%
    1174.61×［1-1/（1+8.0%）^25.79］
    2.4×2.2×0.9×21
    2.4×2.2×0.9×20
    2.4×2.2×0.9×21
    95.74/（2.4×2.2×0.9）
    99.792/95.74
    2.4×2.2×0.9×21
    114.048/95.74
    2.4×2.2×0.9×24
    (41.51+544.44+103.78+166.04)×1.1
    994.9[tan(arccos0.88)-tan(arccos0.95)]
    994.9[tan(arccos0.88)-tan(arccos0.95)]
    994.9[tan(arccos0.88)-tan(arccos0.95)]
    24.4*2+22.8*2

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