“求一个数是另一个数的几倍”、“求一个数的几倍是多少”和“已知一个数的几倍是多少，求这个数”这三种倍数应用题是同一组数量关系，但由于条件和问题变化，解题方法也就不同。学生在解题中往往会因为这些变化而出现错误，特别是求一倍数的应用题。教学“九义”六年制... “Find a number is several times the number of another,” “” What is the number of times a few times? “And” How many times is a number known, how many times is this number? “ However, due to the change of conditions and problems, the solution method is also different. Students in the problem-solving often because of these changes and mistakes, especially for multiple applications. Teaching ”nine justice" six-year system ...