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单选题
If 0>ab3c4, then which of the following must be true?Ⅰ. ab is positiveⅡ. ab is negativeⅢ. abc is negative
A
Ⅰ only
B
Ⅱ only
C
Ⅲ only
D
Ⅰ and Ⅲ only
E
Ⅱ and Ⅲ only
参考答案
参考解析
解析：
Since ab3c4is negative and c4 is positive, then in ab3 one variable is positive and the other negative. Hence ab<0, or negative, so Ⅰ is false and Ⅱ is true. Now let’s look at Ⅲ. You know ab is negative — but you don’t know a thing about C. It could be positive or negative. So cross out E..
Since ab3c4is negative and c4 is positive, then in ab3 one variable is positive and the other negative. Hence ab<0, or negative, so Ⅰ is false and Ⅱ is true. Now let’s look at Ⅲ. You know ab is negative — but you don’t know a thing about C. It could be positive or negative. So cross out E..
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