2. 职称英语
  3. For any numbers a and b, ab=ab(3-b). If a and ab both represent positive numbers

For any numbers a and b, ab=ab(3-b). If a and ab both represent positive numbers

游客2024-01-14  62
问题 For any numbers a and b, ab=ab(3-b). If a and ab both represent positive numbers, which of the following could be a value of b?
选项 A、-5
B、-2
C、2
D、4
E、7
答案 C
解析 The most direct approach to this sort of problem is to plug in the answers and see which one works. Choices A and B are out because any negative value for b would result in a negative value for ab if a is positive. C works because it gives the result ab=2a, which has to be positive. D and E do not work because they result in negative values for ab. Therefore, C is the only answer that provides a possible value for b.
转载请注明原文地址:https://tihaiku.com/zcyy/3360369.html
相关试题推荐
随机试题
最新回复(0)