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有些问题,如果按照题意进行分析数量关系的话比较复杂、抽象,解答起来困难;若采用从比例的角度来入手分析往往可以轻而易举获解。如:一列火车从甲城开往乙城,若每小时行80千米,则中午12时到达;若每小时行120千米,则上午10时可到达;如果要上午9时到达,这列火车的速度应是多少?分析:如果顺着题目的数量关系来思考的话,求速度,要知道路程和时间,很难下手。如果从比的角度进行分析的话,就简单多了。因为前后的速度之比为80:120=2:3,那么行驶
Some questions, if the quantitative analysis of the relationship according to the problem is more complicated, abstract, difficult to answer them; if you start from the perspective of the proportion of the analysis can often easily be solved. For example, if a train goes from City A to City B, it will arrive at 12 noon if it runs 80 kilometers an hour. If it runs 120 kilometers an hour, it will arrive at 10 am; if arriving at 9 am, Train speed should be? Analysis: If the number of questions along the subject to think about, seek speed, to know the distance and time, it is difficult to start. If analyzed from the perspective of the ratio, it is much simpler. Because before and after the speed ratio of 80: 120 = 2: 3, then driving