GRE数学中最容易出错的题目：
1，l1, l2 and l3 are three lines in space
The number of points at The number of points at
which lines l1 and l2 intersect which lines l2 and l3 intersect
1.三条任意直线，L1和L2的交点的个数与L2和L3的交点的个数没关。
2. The number of 1/4-inch lengths in 1
a 4-inch length
2，是问4英尺中有多少个1/4英尺，应该是16个，所以是A
3. The maximun number of solid cubes 4
having edges of length 1/2 meter that
can be placed inside a cubical box
having inside edges of length 1 meter
3边长为1的立方体里最多能放下几个边长为1/2的立方体，当然是8个咯
4. Cube C has volume 8 cubic centimeters
The area of one of the faces of cube C 3 square centimeters
4立方体体积是8，那一个面的面积当然是4咯
5. Ms.Smith got an 8 percent cost-of-living raise of $20 per week
Ms.Smith's new weekly salary $260
5 x*0.08=20，那x+20=270>260
6. On a certain number live, if -7 is a distance of 4 from n and 7 is a distance of 18
from n then n=
A.25 B.11 C.3 D.-3 E-11
6应该是-11
7. For all real numbers a and b. if a·b=a(a+b), then a·(a·b)=
A. a2+ab B a2+ab+a C a2+a+b D a3+a2b E a3+a2b+a2
注：a2表示a平方，a3表示a立方
7新定义的运算a·b=a(a+b), 那a·(a·b)=a·(aa+ab)=a(a+aa+ab)=aa+aaa+aab
8.secretary typed 6 letters,each of which had either 1 or 2 pages.If the secretary typed 10 pages in all, how many of the letters had 2 pages?
A 1 B 2 C 3 D 4 E 5
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