无数据计算题就是题干中不出现数据,而只用文字叙述的题。有些同学遇到这类题,由于找不出数据而无法着手求解,其实,这类题的数据都隐含在题目之中。解题时,只需仔细分析题意,挖掘出隐含的量,建立等量关系,就能迅速准确求解。1 变形法 例1 在FeO、Fe_2O_3、Fe_3O_4三种化合物中,与等质量铁元素相结合的氧元素的质量比为( )。 (A)1:3:4 (B)2:3:6 No data calculation problem is that the data does not appear in the questions, but only in the text. Some classmates encountered such questions because they could not find the data and could not start solving. In fact, the data of such questions are implicit in the topic. When solving a problem, you only need to carefully analyze the meaning of the problem, dig out the implied quantity, and establish an equal quantity relationship so that you can quickly and accurately solve the problem. 1 Deformation Example 1 In the FeO, Fe2O3, and Fe3O4 compounds, the mass ratio of the oxygen element combined with the equal mass of iron is (). (A) 1:3:4 (B)2:3:6