函数知识是中考命题的重点和热点,也是中考的难点所在.函数知识包括平面直角坐标系和函数的有关概念,一次函数、二次函数、反比例函数的概念、图象和性质,这部分内容是中考考查的重中之重。象限的概念,点的坐标的意义,已知点求坐标,已知坐标描点,象限内点的坐标的特征,坐标轴上点的特征及关于x轴、y轴、原点对称的 Function knowledge is the focus and hotspot of the examination proposition. It is also the difficulty of the examination. The function knowledge includes the concept of the plane rectangular coordinate system and the function, the concept, image and nature of the primary function, the quadratic function and the inverse proportion function. This part is The most important thing in the examination is the examination. The concept of the quadrant, the meaning of the coordinates of the point, the coordinates of the known point, the coordinates of the known coordinate, the coordinates of the coordinates of the quadrant, the characteristics of the point on the coordinate axis, and the symmetry about the x-axis, y-axis, and origin