5.m,n 是整数, 问m>n?
(1) m/n > 1
(2) (m-n)/n > (m-n)/m
(E)
6.150 houses,60% have A ,50% have B, 30% have C, 5 have none, 5 have three of them. ask how many have only two of them. (55)
9.有图。四边形 ABCD,AB=BC=2,角ABC=90度,ADC=60度,问四边形的面积。2+2根号3
10. what is the hundredth digit of (x.y)^2 (x y 为一个小数的个位和十分位)
(1)x=3 (2)y=4
Answ: b
11. x能被12整除么? (1)x/2 是3的倍数 (2) x/2 is even
Answ: c作者: primefang 时间: 2002-8-8 10:31
1 正确, 当心0是偶树
2 正确
3 好象不对, 如果他们都等于5 答案也成立
4 正确
5 正确, 考虑负树
6 正确,
三个集合的公式
7 9/(x+9) * 8/(x+8) = 6/11 x= 3, so the answer is 12
8 代公式, 正确
9 sorry
10 正确
11 正确
7
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