教学具有高度的抽象性和理论性,它往往掩盖着它来源于客观现实的物质性,在教学中,如果不注意它的物质本性,就会使教学陷入迷惘之中,从而导致学生死学、厌学,但是,如果能恰当地引导学生观察实物、模型等直观教具,进行直观教学,不仅能够加强学生对数学概念的理解,而且还可启发学生由感性认识到理性认识的思维。使学生清楚认识与区分易混淆的数学概念。学生对一个数学概念的认识与理解,也和 Teaching is highly abstract and theoretical, which often obscures its materiality from objective reality. In teaching, if it does not pay attention to its material nature, it will make teaching confused, leading to students’ death, However, if students can intuitively guide the students to observe the visual aids and models and conduct visual teaching, they can not only strengthen students’ understanding of mathematical concepts, but also inspire students to think of sensibility to rational cognition. Enable students to clearly understand and distinguish easily confused mathematical concepts. Students understand and understand a mathematical concept as well