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在教学分数应用题之前,用下面两组相应的文字题作基础,让学生熟练地掌握这些文字题的特点和解法。第一组用乘法解的文字题:1.2500的3/5是多少?2.2500的(1-1/5)是多少?3.2400的(1+1/4)是多少?第二组用除法解的文字题:1.已知一个数的8/9是120,求这个数。2.已知一个数的(1-1/9)是120,求这个数。3.已知一个数的(1+1/3)是2000,求这个数。通过这两组文字题的教学,让学生弄清楚:哪个是关键的分数,哪个是关键分数的对应数量,哪个是作为整体1的量(用不同的符号把这三个数量
In the teaching scores before the problem, with the following two groups of the corresponding text questions as a basis for students to master the characteristics of these text problems and solutions. The first group of multiplication solution with the text question: 1.2500 3/5 What is the number? 2.2500 (1-1 / 5) What is the number? 3.2400 (1 + 1/4) What is the second group with the solution of the text Question: 1. Known a number of 8/9 is 120, find the number. 2. Known number (1-1 / 9) is 120, find the number. 3. Known a number of (1 + 1/3) is 2000, find this number. Through the teaching of these two groups of text questions, students are asked to clarify: which is the key score, which is the corresponding number of key scores, which is the amount as a whole (using these three numbers with different symbols