已知函数f(x)=x3+3ax-1,g(x)=f′(x)-ax-5,其中f′(x)是f(x)的导函数. 对满足-1≤a≤1的一切a的值,都有g(x)<0,求实数x的取值范围;
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结合教学实际,谈谈在具体数学教学中如何有效处理生成与预设的关系.
已知函数f(x)=x3+3ax-1,g(x)=f′(x)-ax-5,其中f′(x)是f(x)的导函数. 设a=-m2,当实数m在什么范围内变化时,函数y=f(x)的图像与直线y=3只有一个公共点。
CORPORATE TRAVEL EXHIBITIONThis year"s Corporate Travel exhibition will take place on 13 and 14 October. The exhibition is twice the size it was last year 1 the organisers have been successful in attracting many more 2 airlines, hotels and car rental companies than in the past. 3 150 companies will have stands 4 the exhibition.During the two days of the exhibition, 5 will be a programme of seminars 6 a wide range of subjects related to business travel. Each of 7 will provide professional advice on ways in 8 firms can obtain a high level 9 service at the most competitive prices. Participants will have the opportunity to learn 10 to achieve savings of up to 40% on 11 annual travel budgets.The exhibition will be open 10.00-17.00 on 12 days.
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教育改革已经紧锣密鼓,教学中应确立这样的思想“以促进学生的全面发展为本,以提高全体学生的数学素质为纲”,作为教师该如何去做呢谈谈高中数学新课程改革对教师的要求.