因为A交B={9},
所以
9属于A
当x^2=9
x=3,-3
x=3,A={9,5,-4},B={-2,-2,9}(不符合,所以舍去)
x=-3,A={9,-7,-4},B={-8,4,9}
此时A并B={9,-7,-4,-8,4}
当2x-1=9,x=5
A={25,9,-4},B={0,-4,9},
不满足A交B={9},所以舍去.
所以所求的A并B={9,-7,-4,-8,4}