Q20:
For any integers x and y, min(x, y) and max(x, y) denote the minimum and the maximum of x and y, respectively. For example, min(5, 2) = 2 and max(5, 2) = 5. For the integer w, what is the value of min(10, w) ?
(1) w = max(20, z) for some integer z.
(2) w = max(10, w)
Answer: D
这题是甚么意思啊?? 为什么是D呢??
这题应当这样想,对于1) w=max(20,z),如果z>20,则w=z>20,如果z<20,则w=20,所以w>=20,因此min(10, w)=10,
同理2)可以推出min(10, w)=10
所以D对
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