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学生解答分数乘除法应用题,必须学会找出要求的数量或已知的数量是标准量的几分之几,要选准“对应量”。在分数乘除法应用题里,判定标准量的方法,主要是弄清题目中的“几分之几”是对谁说的,它是谁的几分之几。被比的那个数就是标准量。例如,成昆铁路全长1100公里,桥梁和隧道约占全长的2/5。桥梁和隧道的有多少公里?其中“桥梁和隧道约占全
Students answer scores by multiplication and division questions, you must learn to find out the number of requirements or known amount is a fraction of the standard amount, to select the “corresponding amount.” In the fractional multiplication and division of application problems, the method of determining the standard amount, the main problem is to find out what the “few” to whom, who is a few. The number is compared to the standard amount. For example, the Cheng-Kun Railway is 1,100 kilometers in length and bridges and tunnels account for about two-fifths of the total length. How many kilometers of bridges and tunnels? Among them, "bridges and tunnels account for the whole