题目

设命题：实数满足不等式；命题：函数 有极值点.（1）若为真命题，为假命题，求实数的取值范围；（2）若为真命题，并记为，且，若是的必要不充分条件，求实数的取值范围. 答案：【答案】（1）；（2）【解析】（1）先求得命题为真命题时，实数的取值范围，在结合题设条件，得出和只有一个命题是真命题，分类讨论，即可求解；（2）由是真命题，求得，再由命题为真命题，求得或，所以，根据是的必要不充分条件，列出不等式组，即可求解.（1）由题意，若为真命题，则，解根据短文内容，从短文后的选项中选出能填入空白处的最佳选项，选项中有两项为多余选项。（如果所用的答题卡没有E、F、G选项，则选E涂A、B，选F涂A、C，选G涂A、D。）Every student has tests when they are at school. But have you ever been so worried about the tests that you can’t fall asleep at night? Have you ever felt sick or had a headache during a test?  小题1:__  This worry in your mind can make your body feel bad. You may feel angry, frustrated, scared, or afraid, which can give you a stomachache or a headache.小题2:__ Good or normal stress might happen when you are called to answer a question in class or when you have to give a speech. This kind of stress can help you to get things better done.  小题3:__But bad stress can happen if the stressful feelings keep going over a long time. You may not feel well if your parents are fighting, if a family member is ill, if you are having problems at school, or if you are going through anything else that makes you upset every day.  小题4:__小题5:__  That means making good decision about how to spend your time. If you are only dealing with school stuff and have no time to play, you can get stressed. Make sure you keep your SELF in mind: Sleep, Exercise, Leisure and Food. If you take care of yourself and get enough sleep and food, and if you exercise and leave time for fun stuff, you will probably be less stressed out!A．However, there are two different kinds of stress.B．Can you tell a kind of stress from another one?C．The best way to keep stress away is to have a balanced life.D．That kind of stress isn’t going to help you, and it can actually make you sick.E. Since bad stress is harmful to us, you’d better try to change it into good stress.F. If so, then you know what stress is. Stress is what you feel when you are worried or uncomfortable about something.G. For example, you may do a better job on your test if the stress pushes you to prepare well before the test.