... a similar problem with Monty Hall problem Recall that 1 envelope has twice as much as the other, so envelope A has either $500 or...
...線是圓的包絡線。 參考http://residence.educities.edu.tw/kuen/maths/ envelop .htm 參考www.math.ntnu.edu.tw/~cyc/_private/m1117.doc 參考http://www.ttsh.tp.edu.tw/~a008...