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题库 / Prep2007E1-DS-168
On the number line, the distance between x and y is greater than the distance between x and z. Does z lie between x and y on the number line?
(1) xyz < 0
(2) xy < 0
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.
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1+2，xy0得出两种情况一：x>0,y0,或者二：x0,z>0
情况一：因为x>0,z>0,所以z可以在x的右边，y----0--------x----z
情况二：x----0---z-----y
所以1+2不充分
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