几何一道--------------要求解的等腰三角形的两边是1，怎么求面积啊

暮云春树

……楼主，求的是中位数不是平均数，跟后面是多大没关系。

50%这个点只能在3了，后面跟一个要一百万人的project也没关系。

manlin

春树侠 ，解到题目吧？Q2:OnSaturday morning, Malachi will begin a camping vacation and he willreturn home at the end of the first day on which it rains.  If on thefirst three days of the vacation the probability of rain on each dayis 0.2, what is the probability that Malachi will return home at theend of the day on the following Monday?

0.008
   
0.128
   
0.488
   
0.512
   
0.640

1. ?r²
       
   
2. ?r²    + 10
       
   
3. ?r²    + ¼ ?²r²
       
   
4. ?r²    + (40-2?r)²
       
   
5. ?r²    + (10- ½ ?r)²
   
   
   

暮云春树

……这算是指名要我了么。

应该选第二个，这哥们会在第一天下雨的晚上回来，问他第三天晚上回来的概率多大。

也就是说前两天是晴天第三天下雨多大概率。

0.8*0.8*0.2=0.128。

manlin

对啊，春树侠今天这两题拜托你了啊
Howmany seconds will it take for a car that is traveling at a constantrate of 45 miles per hour to travel a distance of 22 yards?    (1 mile =1,160 yards)

8
   
9
   
10
   
11
   
12


我的式子是 22y/(45m/h)=22y/{ (45*1160y)/3600s } 算出来不对啊


Q8:
Athin piece of wire 40 meters long is cut into two pieces.  One pieceis used to form a circle with radius r, and the other is used to forma square.  No wire is left over.  Which of the following representsthe total area, in square meters, of the circular and the squareregions in terms of r?



?r²
   
?r²    + 10
   
?r²    + ¼ ?²r²
   
?r²    + (40-2?r)²
   
?r²    + (10- ½ ?r)^{2
这个我选c，答案是e。。。}

525170980

e肯定是在ac这个延长线上了。有一个45°角。e到ac底边的高就是2分之根号2.面积就出来了

manlin

春树大侠，数学机经36题有没有看， 寻解答

614000

拿到集合题我咋个会毫不犹豫的选择2分之1蓝，我把CE想成垂直于ABCD平面的了。然后就。。。。。。