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.