GMAT考试

根据网考网考试中心的统计分析，以下试题在2019/3/20日GMAT考试习题练习中，答错率较高，为：42%
【单选题】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
A、-5
B、-2
C、2
D、4
E、7

网考网参考答案：C，答错率：42%
网考网试题解析：
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. document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>