|x|=
,有|x|<
;|x|>
例题:OG13-P275-1
What is the value of |x| ?
(1) x=-|x|
(2) x2 = 4
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 statement TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D EACH statement ALONE is sufficient.
E Statements (1) and (2) TOGETHER are NOT sufficient.
解析:条件一很明显不充分,条件二,可以求出 |x| =2,充分,所以选B
例题:OG16-P186-111
If [x] denotes the least integer greater than or equal to x, is [x] =0 ?
(1) -1 < x < 1
(2) x < 0
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 statement TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D EACH statement ALONE is sufficient.
E Statements (1) and (2) TOGETHER are NOT sufficient.
解析:题干:如果[X]表示的是比x大或等于的最小整数,那么请问[x]等不等于0?
注意:题干说的是[X]是整数,没说x是整数,即x有可能是小数。
解答:(1)当-1
(2)当x<0时,x可以是很多很多取值,所以不充分。
联立(1)(2)当-1
所以选C
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