2. 外语
  3. What is the value of x/yz? (1) x = y/2 and z = 2x/5. (2) x/z=5/2 and 1/y=1/10.

What is the value of x/yz? (1) x = y/2 and z = 2x/5. (2) x/z=5/2 and 1/y=1/10.

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问题 What is the value of x/yz?
(1) x = y/2 and z = 2x/5.
(2) x/z=5/2 and 1/y=1/10.
选项 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.
答案B
解析 (1)    Given that x = y/2 and z = 2x/5, it follows that x/yz=, which will have different values for different nonzero values of x; NOT sufficient.
(2)    Given that x/z = 5/2 and 1/y = 1/10, it follows that x/yz=; SUFFICIENT.
The correct answer is B;
statement 2 alone is sufficient.
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