34、X是否小於零 ?
1)X的三次方小於X的二次方
2)X的三次方小於X的四次方
the answer should be C.
Let's consider the case in B, If x^31 or <0 .
for example, 2^3<2^4, or (-2)^3<(-2)^4. So B is wrong.
In the case of A, we can get the range of x is either between 0 and 1 (exclusive) or <0. So A is wrong.
When A and B are combined, x can only be negative, which leads to Answer C.作者: tongxun 时间: 2002-10-12 09:06
是C 啊。哎呀,我自己上面那帖写错了。
2 的3次方小于2的4次方 ----因此,不一定象hytseng讲的“我选 B , 因为 x 只有成为负数才能成立X的三次方小于X的四次方”
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