(1)(x+1)(x-1)>=0 x=1
A=(-无穷,-1】∪【1,+无穷)
2a-x>0 x0 x>a+1
x-a-1≠1 x≠a+2
B=(a+1,a+2)∪(a+2,2a)
(2)
B是A的子集,
(i)2a