∵A={x|x^2-3x+2=0,x属于R},集合B={x|x^-2x-2a=0,x属于R},
A:X=1或x=2 ,
若A并B=A,∴B包含于A
B:X=1或B:X=2(舍),B:X=1或X=2(舍),B:Φ
∴a=-1/2或a＜-1/2
所以：a≤-1/2