设集合A={X│X^2
问题描述:
设集合A={X│X^2
答
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 -2