版主谢谢你
K＝0.1－（0.1）^2 问x>0.05?
a. k>0.009/x b k<0.0009/x .但是，第一个条件中，X<0也可以成立，所以我认为A仍然不对。
另外一题
20．If x and y are positive integers such that x=8y+12,what is the greatest common divisor of x and y?
1) x=12u,where u is an integer
2) y=12z,where z is an integer
HOW TO DEAL WITH THIS KIND OF QUESTION? 谢谢！
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