暴!急!!高二数学问题解答已知A={x|(x+1)(x
已知A={x|(x+1)(x-2)>0,x∈Z},B={x|(2x+5)(x+k)<0,x∈Z} 且A∩B={-2},求实数k的值.
A={x|(x+1)(x-2)>0,x∈Z}=={x|x<-1或x>2,x∈Z}= =={......-3,-2,,3,4,5,......} ∵A∩B={-2},-2∈B,∴[2×(-2)+5)(-2+k)]<0→k<2............(1) ∴B=={x|(-5/2