论文部分内容阅读
近年来各省市的中考题中,由一元一次不等式(组)与一次函数或二次函数相结合构成的方案问题,成为了命题热点.命题者之所以看中此类题目,除了考虑落实新课程标准之外,还有考查考生解决数学问题的缜密性、完整性等数学能力等.2011年版义务教育数学课程标准对一次函数的教学要求是"(1)结合具体情境体会一次函数的意义,能根据已知条件确定一次函数的表达式.(2)会利用待定系数法确定一次函数的表达式.(3)能画出一次函数的图象,根据一次函数的图象和表达式y=kx+b(k≠0)探索并理解k>0和k<0时,图象的变化情况.
In recent years, in the examination questions of provinces and cities, the program problem consisting of a one-time inequality (group) combined with a function or a quadratic function has become a proposition hot spot. The reason why the proposition person takes a fancy in this kind of topic is to consider the implementation of the new curriculum. In addition to the standards, there are also the ability to examine the mathematics of candidates to solve mathematical problems such as meticulousness, completeness, etc. The 2011 compulsory mathematics curriculum standard for compulsory education requires the teaching of a function to be a combination of the specific context and the significance of the first function. The expression of the primary function can be determined according to the known conditions. (2) The expression of the primary function is determined by the method of the undetermined coefficient. (3) The image of the primary function can be drawn, based on the image and expression of the primary function y= Kx+b(k≠0) Explores and understands how the image changes when k>0 and k<0.