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题库 / OG2017Q-DS-243
What is the value of a - b ?
(1) a = b + 4
(2) (a - b)2 = 16
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
题目分析：
（1） 给定条件1，两边同时减b得a-b=4，题目得解。
（2） 给定条件2，a-b=4和a-b=-4均满足条件2，所以无法确定。
因此，本题答案为（A），仅条件1可以解题，条件2不行。