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)
    [1.2*26.23+0.23*30－5.4－10.8*1*100%]
    [1.2*26.37+0.23*26－5.4－10.8*0*100%]
    [1.2*26.37+0.23*26－5.4－10.8*0*100%
    sin180
    sin36.869898*cos36.869898*2
    sin(36.869898*2)

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