20-8+12
    88-(45-16)
    37+27/3
    28/7*6
    35+21/7
    3+5*9
    7*(43-38)
    48/8*9
    25-12+45
    6*7+3
    72-18/9
    48/(8-2)
    76-39
    12+27
    12+27
    272.39×（1+0%）×0.9719
    398×0.9087×（1-0.0154）×0.7743×0.9787+0
    398×（1-0.0154）×0.7743×0.9787+0
    1-1/（1+7.92%）^35.32
    （137.70+55.00+33.00+6.14+18.06）×5%

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