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题库 / Prep2007E2-DS-164
If mv < pv < 0, is v > 0 ?
(1) m < p
(2) m < 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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当m < p < 0，则 v > 0 ， mv < pv < 0成立；当0 < m < p，则 v < 0 , mv < pv < 0不成立
m小于0，mv小0，则，v一定大于0
If v>0v>0 then when dividing by vv we would have: m0v>0. Sufficient.
(2) m < 0 --> we have the first case, so v>0v>0. Sufficient.
Note: Given: mv0. Sufficient.
(2) m < 0 --> we have the first case, so v>0v>0. Sufficient.
当m < p < 0，则 v > 0 ， mv < pv < 0成立；当0 < m < p，则 v < 0 , mv < pv < 0不成立
当m < p0，mv
(1) 当m