2016.OG数学第18题，答案不应该是B吗？

毕穹 · 发表于 2016-3-22 14:16:35

【18.Is x = ?】
(1) xy = 1
(2) 1/xy= 1

Algebra Equations
(1) This indicates that neither x nor y can be zero because if x = 0 or y = 0,
then xy = 0. Since xy = 1 and y ≠ 0, then dividing both sides by y gives x = ;
SUFFICIENT.
(2) This indicates that neither x nor y can be zero because if x = 0 or y = 0,
then xy = 0, and division by zero is undefined. Multiplying both sides of the
equation by x gives = x; SUFFICIENT.
The correct answer is D; each statement alone is sufficient.

原文没有Y ≠ 0，所以（1）应该是NOT SUFFCIENT

请大神赐教？？

温润的风 · 发表于 2016-3-22 14:31:53

有没有都不重要吧

毕穹 · 发表于 2016-3-22 14:43:31

谢谢，我已经意思到自己的问题了。乘积为1，Y必不为0。哈哈哈昏了

2016.OG数学第18题，答案不应该是B吗？

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