设集合A={X│X^2

问题描述:

设集合A={X│X^2

4/(x+3)-1>0
(4-x-3)/(x+3)>0
(1-x)(x+3)>0
(x-1)(x+3)x^2+2x-32x^2+4x-6所以a=4,b=-6
A -2B -3所以是{x|-2