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Q4:
What is the value of v3 – k3?
(1) v k > 0
(2) v – k = 6
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.
为何答案是E？1+2得
Answer: (v-k)^3=v^3-k^3-3k v^2+3vk^2
6^3=v^3-k^3-3vk(v-k)
v^3-k^3=6^3+3vk(v-k)
v^3-k^3=6^3+18vk
大于0，选C
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发表于 2004-11-24 18:48:00
