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在解答分数应用题时,有的同学由于找不准“标准量”也就是“单位1”,而导致解题错误,我们来看几个这样的例子。例1:在80克水中放入20克糖,糖占糖水的几分之几? 错解:20÷80=1/4 分析:这是一道求一个数是另一个数的几分之几的应用题。解这类应用题时,关键找清谁与谁比,正确地找出比较的“标准”,求糖占糖水的几分之几,就是“糖”与“糖水”比较,糖水的重
When answering the question of applying for a grade, some students find mistakes in solving the problem because they can not find the “standard quantity” or “unit 1”. Let's look at a few examples. Example 1: In 80 grams of water into the 20 grams of sugar, sugar accounted for what a few of the water? Misunderstanding: 20 ÷ 80 = 1/4 Analysis: This is a way to find a number is a few of the other a few Application questions. Solution of such applications, the key to find out who is compared with whom, the correct to find out the more “standard” for sugar, accounting for a few of the sugar, is the “sugar” and “sugar” compared to the weight of sugar