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题库 / Prep2007E2-DS-188
Is x4 + y4 > z4 ?
(1) x2 + y2 > z2
(2) x + y > z
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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x^2=3 , y^2=4 , z^2=5 (1) x^2 + y^2 > z^2 成立， 题目不成立，题目里没有说明xyz都是整数，所以不充分登录 或 注册 后可以参加讨论