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分数百分数应用题的解题关键是掌握它们的数量关系,即“总量”与“部分量”“甲量”与“乙量”之间的倍比关系。如:“畜牧场共养山羊和绵羊4800只,山羊占3/8,山羊、绵羊各有多少只?”这道题是以总只数4800只为整体“1”。把它分为两部分,一部分是山羊占总数的3/8,求山羊有多少只,就是求4800只的3/8是多少。另一部分是绵羊,占总数的(1-3/8),4800只的(1-3/8)是多少即是绵羊数。求一共有多少只就是求整体“1”。这些都属于“甲乙两个量之间”或者说“总量和部分量”之间的倍比关系。如果用“标准量”表示整体“1”,用“倍数”表示分数(百分数),用“比较量”表示与整体“1”有倍数关系的量,可用下列
The key to solve the problem is to grasp the relationship between them, that is, the “total” and “partial volume” “A” and “B” the ratio between the ratio. For example, “There are 4800 goats and sheep in stock farms, 3/8 in goats, and how many goats and sheep are there?” This question is based on the total number of 4800 as a whole. Divided into two parts, one part is 3/8 of the total number of goats, how many goats, that is, what is the 3/8 of 4800? The other part is the number of sheep (1-3 / 8) and 4800 (1-3 / 8) which is the number of sheep. Seeking the total number of just seeking the overall “1”. These belong to the “A and B between the two” or “total and partial volume,” the ratio between the ratio. If “1” is indicated by “standard amount”, “fraction” is used as the fraction (percent), and “amount of comparison” is used as the amount that is multiples of the whole “1”, the following