Problem Solving
试题详情
题目：
The operation Θ is defined by x Θ y = 
+
for all nonzero numbers x and y . If z is a number greater than 1, which of the following must be true?
+ for all nonzero numbers x and y . If z is a number greater than 1, which of the following must be true? I. x Θ (-z) = 0
II. z Θ 
= 1
= 1 III. 
Θ 
= z
ansi Θ = z选项:
A、I only
B、I and II only
C、I and III only
D、II and III only
E、I, II, and III
答案:
D
