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- 2011-4-28
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- 1970-1-1
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1。if n is a positive integer less than 200 & 14n/60 is an integer, then n has how many different positive prime factor?
2。What is the greatest common divisor of positive integers m and n? (1) m is a prime number (2) 2n=7m
3。In the xy-plane, does the line with equation y=3x+2 contain the point (r,s)? (1) (3r+2-s)(4r+9-s)=0 (2) (4r-6-s)(3r+2-s)=0
4. Of the 60 animals on a certain farm, 2/3 are either pigs or vows, how many of the animals are cows? (1) the farm has more than twice as many cows as it has pigs. (2) the farm has more than 12 pigs
5. If the terms of a sequence are t1,t2,...,tn, what's the value of n? (1) the sum of the n terms is 3124 (2) the average of n terms is 4
希望NN们能给个提示 不用特别详细。。。谢谢啦!! |
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