超级菜鸟问数学题 超级求救

typhoon_wang

PRE: 的 87:

[attachimg=576,219]78177[/attachimg]

In the addition table shown above, what is the value of m + n ?



(A) -19

(B)4

(C)5

(D)6

(E)22

这图怎么看呀?   E=1+15+M=4???别的呢?  

typhoon_wang

还有78:  
From a bag containing 12 identical blue balls, y identical yellow balls, and no other balls, one ball will be removed at random.  If the probability is less than 2/5 that the removed ball will be blue, what is the least number of yellow balls that must be in the bag?

(A) 17
(B) 18
(C) 19
(D) 20
(E) 21
这题是 18 吗?   呵呵 非常菜的菜鸟,请大家不要见怪哦

typhoon_wang

还有一道这样的题:

(10`8-10`3)/(10`7-10`2)
大概等于多少?

这种题的接题方法是什么? 非常的惭愧     谢谢

typhoon_wang

这个题呢?  
For which of the following functions is f(a + b) = f(a) + f(b) for all positive numbers a and b ?

(A) f(x) = x 2
(B) f(x) = x + 1
(C) f(x) = √x
(D) f(x) = 2/x
(E) f(x) = -3x

typhoon_wang

自己顶一下   快考了哦  大家星星好

Carrie2009

还有78:  
From a bag containing 12 identical blue balls, y identical yellow balls, and no other balls, one ball will be removed at random.  If the probability is less than 2/5 that the removed ball will be blue, what is the least number of yellow balls that must be in the bag?

(A) 17
(B) 18
(C) 19
(D) 20
(E) 21
这题是 18 吗?   呵呵 非常菜的菜鸟,请大家不要见怪哦

-- by 会员 typhoon_wang (2010/6/10 6:07:06)

这题是不是选C？ 如果概率等于2/5，y=18。但是概率小于2/5，所以y≥19（y只能是integer）

typhoon_wang

谢谢  carrie mm    谁帮我看看那个图是怎么看的?

Nickyl86

很简单啊，就是几+几=几呀
eg: x+4=1; y+4=-5
我算出来答案是5

sunday七月

图题~
意思应该是第一行分别加左边一列的数字等于两数交叉线上的数字。如4+x=1，e+n=y。所以经4+x=1，4+y=-5可得x=-3，y=-9~
再由e+x=7即e+（-3）=7，得e=10，结合上面的y可得n
再根据上述方法求f，m。
最后得m+n=5
选C

typhoon_wang

谢谢　　终于明白这个破图了　　　呵呵