不等式1-xx-3≥0等价于(1-x)(x-3)≥0x-3≠0
解得x∈[1,3)
故答案为:[1,3﹚
The following data sufficiency problems consist of a question and two statements, labeled (1) and (2), in which certain data are given. You have to decide whether the data given in the statements are sufficient for answering the question. Using the data given in the statements plus your knowledge of mathematics and everyday facts (such as the number of days in July or the meaning of counterclockwise), you must indicate whether.
Two cyclists are racing up a mountain at different constant rates. Cyclist A is now 50 meters ahead of cyclist B. How many minutes from now will cyclist A be 150 meters ahead of cyclist B ?() (1) 5 minutes ago, cyclist A was 200 meters behind cyclist B. (2) Cyclist A is moving 25% faster than cyclist B.
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.
备用电源自动投入装置基本要求有()。
A.起动部分应能反映工作母线失去电压的状态
B.工作电源断开前,备用电源应先投入,防止失去电源
C.装置应只动作一次
D.电压互感器二次侧熔丝熔断时备用电源装置应不动作
E.当备用电源无电压时,备用电源装置也应动作,以便尽快回复送电