问5个数学题_烦请高人解答

lujiamu · 发表于 2011-9-2 13:13:02

6. In the decimal representation of x, where 0<x<1, is the tenth digit nonzero?
1. 16x is an integer.
2. 8x is an integer.

7. What is the remainder when the positive integer x is divided by 8?
1. When x is divided by 12, the remainder is 5.
2. When x is divided by 18, the remainder is 11.

8. If x,y and k are positive number such that (x/x+y)(10)+(y/x+y)(20)=k and if x<y, which of the following could be the value of k?
10,12,15,18,30

9. A shipment of 8 television sets contains 2 black-and-white sets and 6 color sets, if 2 television sets are to be chosen at random from this shipment, what is the probability that at least 1 of the 2 sets chosen will be a black and white set? 概率，烦请列出公式。

10. In a certain game player with red card and blue card, each red card has a point value of x and each blue has a point value of y, wherex>y and x and y are positive integers. If a player has 5 red card and 3 blue cards, what is the average point value of the 8 cards that the player has?
1. The average point value of one red and one blue card is 5.
2. The average point value of the 8 cards that the players has is an integer.

问5个数学题_烦请高人解答

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