1£®Èô¼¯ºÏA={x|1≤x≤3}£¬B={x|x£¾2}£¬ÔòA∩BµÈÓÚ£¨  £©

A {x | 2£¼x≤3}          B {x | x≥1}      C {x | 2≤x£¼3}    D {x | x£¾2}

2ÏÂÁк¯ÊýÊÇÃݺ¯ÊýµÄÊÇ  £¨    £©                                         

A. y=2^x   B. y=2x^-1 C. y=£¨x+1£©²   D. y=

3. ÏÂÁÐËÄ×麯ÊýÖУ¬±íʾÏàµÈº¯ÊýµÄÒ»×éÊÇ£¨  £©