1£®ÓÃÁоٷ¨±íʾ¼¯ºÏ{x|x2£­2x£«1£½0}Ϊ(¡¡¡¡)
A£®{1,1}¡¡¡¡¡¡¡¡¡¡¡¡¡¡B£®{1}
C£®{x£½1} D£®{x2£­2x£«1£½0}
2£®ÒÑÖª¼¯ºÏA£½{x|£­1A£®A>B¡¡¡¡¡¡¡¡ B£®A = B
C£®B⊆A D£®A⊆B