256.82×0.311-2×4.7×√0.311
    243.61×0.311-2×4.7×√0.311
    243.61+18.9×0.7
    (421.02×3.14+470.78×0.80)/(31.68×6.08+290.68×3.36+128.11×0.83)
    96.96×3.215+2×4.7×√3.215
    64.83×3.215+2×4.7×√3.215
    64.83+18.9×1.7
    274.72×0.311-2×4.7×√0.311
    243.61×0.311-2×4.7×√0.311
    243.61+18.9×1.7
    1/9801
    tanarccos0.81
    arctan0.492
    arctan0.492
    20％+arctan（2.5*0.3-0.5）×20％/π
    20％+arctan（2.5*30%-0.5）×20％/π
    3^0.2
    3^4.2
    log(3,100)
    log(3,27)

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