Ò»¡¢Ñ¡ÔñÌâ

1£®²»µÈʽ≥0µÄ½â¼¯Îª(¡¡¡¡)

A£®{x|£­1<x≤1}¡¡                                B£®{x|£­1≤x<1}

C£®{x|£­1≤x≤1}                               D£®{x|£­1<x<1}