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发帖数: 19398 | 1 美国数学教育发展简史(1950～)zz
Teaching Math in 1950's — A logger sells a truckload of lumber for $100. Hi
s cost of production is 4/5 of the price. What is his profit ?
Teaching Math in 1960's — A logger sells a truckload of lumber for $100. Hi
s cost of production is 4/5 of the price, or $80. What is his profit?
Teaching Math in 1970's — A logger exchanges a set "L" of lumber for a set
"M" of money. The cardinality of set "M" is 100. Each element is worth one d
ollar. Make 100 dots representing the elements of the set "M". The set "C",
the cost of production, contains 20 fewer points than set "M." Represent the
set "C" as a subset of set "M" and answer the following question: What is t
he cardinality of the set "P" for profits?
Teaching Math in 1980's — A logger sells a truckload of lumber for $100. Hi
s cost of production is $80 and his profit is $20. Your assignment: Underlin
e the number 20.
Teaching Math in 1990's — A logger cuts down a beautiful forest because he
is selfish and inconsiderate and cares nothing for the habitat of animals or
the preservation of our woodlands. He does this so he can make a profit of
$20. What do you think of this way of making a living? Topic for class parti
cipation after answering the question: How did the birds and squirrels feel
as the logger cut down their homes? (There are no wrong answers, and if you
feel like crying, it's ok.)
Teaching Math in 1996 — By laying off 40% of its loggers, a company improve
s its stock price from $80 to $100. How much capital gain per share does the
CEO make by exercising his stock options at $80? Assume capital gains are n
o longer taxed, because this encourages investment.
Teaching Math in 1997 — A company out-sources all of its loggers. The firm
saves on benefits, and when demand for its product is down, the logging work
force can easily be cut back. The average logger employed by the company ea
rned $50,000, had three weeks vacation, a nice retirement plan and medical i
nsurance. The contracted logger charges $50 an hour. Was outsourcing a good
move?
Teaching Math in 1999 — A laid-off logger serving time in Folsom for going
postal and doing some bad things is now being trained as a COBOL programmer
in order to work on Y2K projects. What is the probability that the automatic
cell doors will open on their own as of 00:01, 01/01/00?
Teaching Math in 2005 — Un le?ador vende una carga de madera por $100. El c
osto de producción es.... Press one to hear the question in English. |
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