数学是一门抽象科学,在学习中需要教师加以指导,并且能够针对学生的学情采取不同的教学方法。笔者从感性到理性把握教材,认识函数的单调性,采取了适宜的教学方法,从而提高了教学效益。1感性理解增减函数对于刚接触函数的学生而言,教材中采用的是二次函数f(x)=x~2来说明:f(x)=x~2的图像在y轴的右侧是上升的,左侧是下降的。这主要是从学生的感 Mathematics is an abstract science, which requires teachers to guide it in learning and can adopt different teaching methods according to students’ learning. The author grasps the textbook from perceptuality to rationalness, recognizes the monotonicity of the function, and adopts appropriate teaching methods to improve the teaching efficiency. Perceptual understanding of the increase and decrease function For students just contact the function, the textbook is used in the quadratic function f (x) = x ~ 2 to illustrate: f (x) = x ~ 2 image on the right y Is up, the left is down. This is mainly from the student’s sense