明天就考了，求助几道数学JJ

hexiaoyanyan

182. (DS) can x divide by 12
1) x divide by 4, reminder 3
2) x divide by 36, reminder 27

211. 问一个polygon得所有内角之和
    1) 边长之和=72
    2) 每个内角都是140度
B?

318. (PS) 2p= 3q+5 求q-1与p-1的ratio
答案是2/3 ?

227. 不等式，x整数，是否 (X-5)^2 < 绝对值 X-1,
1）X<5
2) X<1
B?

243.  (DS) x,y是positive integer,问X的Y次方是否大于900
1) Y>10
2)Y>4x
E?

255．有42个人没人买康乃馨，康乃馨有红的，白的，红白相间的，其中28人的花有红的，24人有白的，请问花束中只有红花的人有几人？

264. 12 current students in chemical department's graduate program had been in the departments' undergraduate program. The 12 students are what percent of the number of current students in departments' graduate program?
1) 200 current students in departments' undergraduate program are not in department's graduate program .
2) 72 current students in departments' graduate program had not been in the departments' undergraduate program.

明天就考试了，急问，谢谢大家啦！

quien

182. (DS) can x divide by 12
1) x divide by 4, reminder 3     x=4m+3,不可被12整除
2) x divide by 36, reminder 27   x=36n+27=9（4n+3），同上

选E

211. 问一个polygon得所有内角之和
    1) 边长之和=72  边长和无法得出是几边形，无法得出内角
    2) 每个内角都是140度   N边形内角=(n-2)*180/n,由题可得n,内角和=(n-2)*180
选B

318. (PS) 2p= 3q+5 求q-1与p-1的ratio

(q-1)/(p-1)=(q-1)/[（3q+5）/2-1]化简得（q-1）/【3/2（q-1）】

=2/3

        

227. 不等式，x整数，是否 (X-5)^2 < 绝对值 X-1,
1）X<5
2) X<1
B?

画图，抛物线（x-5)^2和以X=1对称的直线，成V状，然后就简单了

x<5，可能大于可能小于

X<1,不等式成立，选B

quien

243. (DS) x,y是positive integer,问X的Y次方是否大于900

    

1) Y>10
2)Y>4x
E?

    

代数进去，X=1，两个都不能成立，选E

    

    

255．有42个人没人买康乃馨，康乃馨有红的，白的，红白相间的，其中28人的花有红的，24人有白的，请问花束中只有红花的人有几人？

    

不好意思。。。题目读不懂

    

    

264.
12 current students in chemical department's graduate program had been
in the departments' undergraduate program. The 12 students are what
percent of the number of current students in departments' graduate
program?
1) 200 current students in departments' undergraduate program are not in department's graduate program .
2) 72 current students in departments' graduate program had not been in the departments' undergraduate program.

    

化韦恩图，12/(72+12)=1/7

    

    

    

MM加油啊~~~~~~

天蝎座1107

以下是引用quien在2009-2-23 22:23:00的发言：

182. (DS) can x divide by 12
1) x divide by 4, reminder 3     x=4m+3,不可被12整除
2) x divide by 36, reminder 27   x=36n+27=9（4n+3），同上

选E

这不是都单独回答了问题了么，条件1和条件2单独都可以说明x can't be divided by 12...

D

quien

以下是引用天蝎座1107在2009-2-24 10:18:00的发言：

这不是都单独回答了问题了么，条件1和条件2单独都可以说明x can't be divided by 12...

D

额。。我老是在这种题目上脑抽筋。。。。。。。。。。。的确是D

yinweiyi

255.
42-(24+28)=10 .... ppl that possess both color of flowers
28-10=18....ppl that only possess red ones


i'm taking the exam tomoro as well! 加油~

天蝎座1107

以下是引用quien在2009-2-23 22:23:00的发言：

318. (PS) 2p= 3q+5 求q-1与p-1的ratio

(q-1)/(p-1)=(q-1)/[（3q+5）/2-1]化简得（q-1）/【3/2（q-1）】

=2/3

这题后来的一个cder纠正过，是2p=3q-5这样就移项就可以了。2(p-1)=3(q-3)所以答案是2/3