A4/(x+1)-1>0(4-x-1)/肢余(x+1)=-(x-3)/(x+1)>0(x-3)(x+1)<0-1若历敬滚a<=0则B不成立,是空集,稿配符合B包含于Aa>0则-a包含于-1则-1<=-a所以a<=1,a<=3所以0综上a<=1选B