问题
选择题
0＜x＜5是不等式|x-4|＜4成立的（ ）
A．充分不必要条件
B．必要不充分条件
C．充要条件
D．既不充分也不必要条件
答案
不等式|x-4|＜4的-4＜x-4＜4，0＜x＜8．
由于0＜x＜5，而（0，5）是（0，8）的一个子集，
故0＜x＜5是不等式|x-4|＜4成立的充分不必要条件．
故选A．
搜题请搜索小程序“爱下问搜题”
0＜x＜5是不等式|x-4|＜4成立的（ ）
A．充分不必要条件
B．必要不充分条件
C．充要条件
D．既不充分也不必要条件
不等式|x-4|＜4的-4＜x-4＜4，0＜x＜8．
由于0＜x＜5，而（0，5）是（0，8）的一个子集，
故0＜x＜5是不等式|x-4|＜4成立的充分不必要条件．
故选A．
| 用方框中动词的适当形式填空 | |
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