MATH JJ

GR 2003-01-09 11:34:51

D.S.

1. Is the squrae root of N >100?

1) Suare root of (n+1)>100
2) Suare root of (n-1)>100

P.S. 2. 一圆内有等腰三角形, 三角形的2边长为10, 求圆面积.

3. There are 20 cars in a dealershop, the cars are of 5 different colors including white cars and red cars. The probablility of picking either a white or red car is less than 3/5. What is the greatest possible number of red cars?

DS.

4. Line goes through (5,a). Is the slope<0?

1) Line goes through (a,5)
2) Line goes throug (20,a)

5. What is the value of integer r?
a) 4<(r-1)(r-1)<16
b) 4<(r+1)(r-1)<16

6. What is the variance of 2,3,4,5,6 Given the fomula v=.....

7. K and P are positive integers. WHich of the followings must have a negative solution?

1. X^2+kX+P=0
2. X^2-kx+p=0
3. 记不起来好像是不对

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