I have collected some jjs that have different answers right now, I hope you can confirm the answer for me, thanks a lot!
1 P is a set of integors and 3 is in P,does all the positive multiple of 3 is in P?
1.If x is in P,then x+3 is in P
2.if x is in P,then x-3 is in p
A or d
应该是d
如果3在集合内，且x-3也在，那就说明6也在，由此可以推出9也在，所以。。。。。。。。。。。
2 .t and r are both integers more than 0, is t a divisor of r?
a, t=r ^(n-3)
b, r=t ^ 3n E ?
3．N人团体在50到150之间获得经费的公式为30N—N的平方，某个团体获得的人均经费为160，问有多少人。140
4.三角形顶点：（0，0），（0，10），（5，0），在三角形内部任取一点满足条件y0?
1)x!=0
2)y=0
【确定】A
why not D?
9. X-------Y-----------Z one person starts from X to Z, Y is on the way, the average of the speed is 15 feet per second, ask for the average speed of YZ
1) the average speed of XY is 10 feet per second.
2) from Y to Z use 20 seconds.
A: E or D?
10。3的X次方+1能被10整除吗？ C
1)十位是个位的因子 2)个位是2
or E?
11###A=a^4b^3, what the number of divisors of A?
1) a and b each has only two divisors
2) 5 and 7 are the only prime divisors of A
C
条件一：a,b只要分别为质数就满足了，但不排除有相等的情况；
条件二可以有两种情况：一种a,b分别为5和7，另一种a.b分别为35和1
所以两个条件合起来可推出a,b分别为5和7，从而A的因子数就确定了
I think A is enough , even if a=b, we still can get the number of divisor of A.
12题1：有图，一坐标系中有B(1,2) 和C(4,3) 组成直线BC. 问有A点可以和直线BC组成三角型，可否确定A点在哪个象限内？(数字可能不准)
1） AB=2
2） AC=3
Key: B or C?
Is x+z=y?
1) |x| = y+z 2) x<0 -->C
i think the key is E,isn't it?
###X/X的绝对值〈X？ [C]
1〉-1〈X〈0
2〉X〈X的绝对值
why is c?
1. If x and y are positive integers such that x=8y+12,what is the greatest common divisor of x and y?
1) x=12u,where u is an integer
2) y=12z,where z is an integer
[em12]
26.地球的年龄是1.3*10^17,一年大约是3.2*10^7,以年表示地球的年龄是多少？
9*10^12
is answerright?作者: tongxun 时间: 2002-9-26 11:45
1、A。 条件2）：只能推出3的0-负数倍在集合内，而不能确定正数倍是否在集合内。
其他回来再答。
欢迎光临 国际顶尖MBA申请交流平台--TOPWAY MBA (http://forum.topway.org/)
