26.3实际问题与二次函数(国外英语资料).docVIP

26.3实际问题与二次函数(国外英语资料) Practical problems and two functions Guidance of learning This section has four with quadratic function and image related issues. The first two are practical problems, to solve the problem and let the student use quadratic function knowledge to analyze problems, experience, practical significance of quadratic function in use. This is the key to learning knowledge to practical problems into mathematical problems the transformation to understand the intrinsic link between each number in the practice, and select the appropriate coordinate system to establish the function relationship; after two to broaden the knowledge, is for students to explore the quadratic function and related knowledge together, together, to make a more profound understanding, learning, in addition to accurately draw the picture, should carefully observe the position of each point in the image, through independent exploration, positive research to solve. Thinking integration Analytic emphasis 1. according to the function image, we can find the approximate solution of the two equation or the two inequality According to the function of the approximate solution to common image in the future study and in the senior high school entrance examination is the focus of the festival, therefore, learn to draw accurate image, careful observation and analysis of the image, the image on the abscissa clear point of the x value, the ordinate is the function of the y value. Quadratic function of the image for the quadratic equation with one unknown root by inspiration, generally can only calculate the approximate value. The specific answers, first of all should be drawn images accurately, and then determine the root in which between two adjacent integers, finally estimate the answers. 2. use the two function knowledge to solve the practical problems in production and life Using two function knowledge to solve practical problems fully reflects the application value of mathematics. At the same