a*****g
发帖数: 1320 | 1 【 以下文字转载自 Seattle 讨论区 】
发信人: ashuang (越忙越年轻), 信区: Seattle
标 题: 急问一道数学题
发信站: BBS 未名空间站 (Sat Jan 21 09:54:44 2012, 美东)
A triangle has two sides measuring 4 and 6, respectively
the greatest possible area of the triangle is 12. why?
another one: a box contains 4 cookies, 5 brownies, and 6 doughnuts. two
items are removed from the bag
which probability is greater?
a. the probability that both items are brownies
b. the probability that one item is a cookie and the other is a doughnut
thanks a lot!!! |
W********g
发帖数: 610 | 2 first one:
area= 0.5*a*b*sin (jiajiao)
second one:
a 5/15*4/14
b 4/15*6/14
【在 a*****g 的大作中提到】
: 【 以下文字转载自 Seattle 讨论区 】
: 发信人: ashuang (越忙越年轻), 信区: Seattle
: 标 题: 急问一道数学题
: 发信站: BBS 未名空间站 (Sat Jan 21 09:54:44 2012, 美东)
: A triangle has two sides measuring 4 and 6, respectively
: the greatest possible area of the triangle is 12. why?
: another one: a box contains 4 cookies, 5 brownies, and 6 doughnuts. two
: items are removed from the bag
: which probability is greater?
: a. the probability that both items are brownies
|
a*****g
发帖数: 1320 | 3 谢谢，回头发包子。
【在 W********g 的大作中提到】
: first one:
: area= 0.5*a*b*sin (jiajiao)
: second one:
: a 5/15*4/14
: b 4/15*6/14
|
K********g
发帖数: 9389 | 4 福建开餐馆的我都会
【在 a*****g 的大作中提到】
: 谢谢，回头发包子。
|
d********1
发帖数: 3828 | 5 Wrong answer. Should be
a 5/15*4/14
b 2*4/15*6/14
【在 W********g 的大作中提到】
: first one:
: area= 0.5*a*b*sin (jiajiao)
: second one:
: a 5/15*4/14
: b 4/15*6/14
|
W********g
发帖数: 610 | 6 如果题意没有先后之分，你是对的
【在 d********1 的大作中提到】
: Wrong answer. Should be
: a 5/15*4/14
: b 2*4/15*6/14
|
