明白了,做题时,也粗心了。以为9^(1/3)=3???...
(2) 只是说X<-(9)^(1/3)约等于-2.xxxx,不充分。
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譬如说x^3=-9,则x应该是大于-3的一个负数;那么<-9,情况就要两论了。
2-22 http://forum.chasedream.com/dispbbs.asp?BoardID=22&ID=66304
2-22 http://forum.chasedream.com/dispbbs.asp?BoardID=22&ID=64941
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不好意思。。这题还得问。。为什么条件2不可以呀??
Q22:
If x is negative, is x < -3?
(1) x2 > 9
(2) x3 < -9
A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.
Answer: A
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