若集合A={x|x^2-x-2>0,x∈R},B={x|2x^2+(5+2a)x+5a0,x∈R},B={x|2x^2+(5+2a)x+5a
问题描述:
若集合A={x|x^2-x-2>0,x∈R},B={x|2x^2+(5+2a)x+5a0,x∈R},B={x|2x^2+(5+2a)x+5a
答
若集合A={x|x^2-x-2>0,x∈R},B={x|2x^2+(5+2a)x+5a0,x∈R},B={x|2x^2+(5+2a)x+5a