在数学教学中，根据教学内容的难易，将它们分解成不同层次的问题，使学生易于理解并接受，不失为好的办法。如何设计不同层次的问题 ?我通常采用三种方法。 　　等价变换。将数学问题的部分或全部条件，用它们相应的等价命题来替换，可以增加数学问题的难度。如原题是：在△ In mathematics teaching, according to the difficulty of teaching content, breaking them into different levels of problems, so that students can easily understand and accept, is a good way. How to design different levels of problems? I usually use three methods. Equivalent transformation. Replacing some or all of the mathematical problems with their corresponding equivalent propositions can increase the difficulty of mathematical problems. If the original question is: In △