新编九年义务教育大纲和新教材对二次函数难度要求做了调整,一次函数的位置显得更为突出了,通过一次函数的学习应正确理解其定义、图象、性质,会求函数解析式,掌握待定系数法这一重要数学方法,学会运用数形结合这一数学思想,用以指导二次函数、反比例函数的学习。 The new nine-year compulsory education syllabus and new teaching materials have adjusted the difficulty requirements of the quadratic function. The position of the first-order function appears more prominent. The definition, image, and nature of the function should be correctly understood through the learning of a function and the function analysis will be required. To learn the important mathematical method of the undetermined coefficient method, learn to use the mathematics idea of ​​combination of numbers and forms to guide the learning of quadratic and inverse functions.