标题: 帮着看看这两道题 谢谢啦 [打印本页] 作者: 云香113 时间: 2010-11-1 14:54 标题: 帮着看看这两道题 谢谢啦 If x and y are positive, is 4x > 3y?
(1)x > y - x
(2)x/y < 1
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. If x and y are positive, is 3x > 7y?
(1)x > y + 4
(2)-5x < -14y
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.
If x and y are positive, is 3x > 7y?
(1)x > y + 4
(2)-5x < -14y
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.作者: cindyzhizhi 时间: 2010-11-1 15:03
第一题 条件1 移项 2X>y 同乘2 4x>2y 推不出 条件2 推不出 条件1+2也推不出 选E 第二题 条件1 推不出 条件2 5x>14y 2.5X>7y 那3X>7y成立 选B 不知想的对不对作者: 云香113 时间: 2010-11-1 15:07
谢谢啦~~~