A£®µÈÓÚ0 B£®µÈÓÚ C£®µÈÓÚ D£®²»´æÔÚ
2£®¹ýµã£¨1£¬0£©ÇÒÓëÖ±Ïßx£­2y£­2=0ƽÐеÄÖ±Ïß·½³ÌÊÇ
A£®x£­2y£«1=0 B£®x£­2y£­1=0 C£® 2x£«y£­2=0 D£®x£«2y£­1=0
3£®ÒÑÖªÏòÁ¿ £¬ £¬Ôò £¨ £©
A£® B£® C£® D£®
4£®ÉèA£¬BΪ