作者princearthas (Wanda 火箭)
看板GMAT
標題[計量] 三題PP
時間Thu Dec 20 21:07:54 2007
In the rectangular coordinate system shown above, does the line K not shown
intersect quadrant2 (-,+)那個象限？
1. The slope of K is -1/6
2. The y-intercept of k is -6
Ans: A
我的問題：斜率是-1/6，但線可以移來移去，為什麼選項1就可以得證？
In a certain deck of cards, each card has a positive integer written on it.
In a multiplication game, a child draws a card and multiplies the integer on
the card by the next larger interger. If each possible product is between 15
and 200, 卡片上最小和最大的整數應該是？
A. 3&15
B. 3&20
C. 4&13
D. 4&14
E. 5&14
Ans: C
希望有人可以解釋這題是如何計算的
A vending machine is despense 8 ounces of coffee into a cup.
標準差 0.3 ounce，以下12個數有幾個在1.5標準差以內
7.51 8.22 7.86 8.36 8.09 7.83
8.30 8.01 7.73 8.25 7.96 8.53
A) 4 B) 6 C) 9 D) 10 E) 11
Ans: E
可是我算的過程是 7.55~8.45 之間，所以排除7.51和8.53。所以我選D
想請問我的想法哪裡出問題了呢？
For all positive m
f(m)= 3m when m is odd
f(m)=1/2m when m is even
which of the following is f(9)*f(6)
Ans: 27
我的想法：f(9)*f(6) = 3*9 * (1/2)*6 = 81 和解答不合
想請問我的想法哪裡出問題了呢？
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