GWD12-Q5 求解题思路

Q5:

Is ½x½< 1?

(1)   ½x + 1½ = 2½x - 1½

(2) ½x - 3½
            ≠ 0

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: C

求思路，谢谢。

条件1可以得出X=1/3或3 条件2得出X等于3 所以试C

条件1如何算出X=1/3或者3？

两边都是绝对值，不知道怎么解了

请赐教详细解法，谢谢。

谢楼上！

晕，最基本的方法都忘了……