1£®ÓÃÁоٷ¨±íʾ¼¯ºÏ{x|x2£­2x£«1£½0}Ϊ(¡¡¡¡)
A£®{1,1}   B£®{1}
C£®{x£½1}   D£®{x2£­2x£«1£½0}
[½âÎö]¡¡¡ßx2£­2x£«1£½0£¬¼´(x£­1)2£½0£¬∴x£½1£¬Ñ¡B.
[´ð°¸]¡¡B
2£®ÒÑÖª¼¯ºÏA£½{x∈N*|£­5≤x≤5}£¬Ôò±ØÓÐ(¡¡¡¡)
A£®£­1∈A   B£®0∈A
C.3∈A   D£®1∈A
[½âÎö]¡¡¡ßx∈N*£¬£­5≤x≤5£¬∴x£½1,2£¬¼´A£½{1,2}£¬∴1∈A£¬Ñ¡D.
[´ð°¸]¡¡D
3£®Ò»´Îº¯Êýy£½x£­3Óëy£½£­2xµÄͼÏóµÄ½»µã×é³ÉµÄ¼¯ºÏÊÇ(¡¡¡¡)
A£®{1£¬£­2}   B£®{x£½1£¬y£½£­2}
C£®{(£­2,1)}   D£®{(1£¬£­2)}