arctan79618
    arctan79618
    arctan79618
    arctan1/0.00314
    arctan1/0.00314
    arctan1/0.00314
    arctan1/0.00314
    arctan1/0.00314
    arctan1/0.00314
    【3000*678/（1+3%）】*3%+【1130/（1+3%）】*3%+2000*800*80%*3%+12000*3%
    log(0.9772,0.01)
    log(0.01,0.9772)
    136[13+9*150000000]
    136[13+9*100000000]
    log（3，4）
    104.5×0.5×0.6
    (14/8)*(7+sqrt(49-49/16)+sqrt(49-49/16)+sqrt(49-196/16)+sqrt(49-196/16)+sqrt(49-441/16)+sqrt(49-441/16))
    sqrt(3891)-sqrt(246)
    8*(1/3.5+1/4+1/4.5+1/5)
    8*（1/3+1/3.5+1/4+1/4.5)

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