设全集U=R,A={x丨x＞1｝,B=｛x丨x+a＜0｝,B包含于CRA,求实数a的取值范围

设全集U=R,A={x|1/x 设全集U=R,A={x/x>1},B={x/x+a 设全集U=R,A={x|x>1},B={x|x+a 设全集U=r,A{x|x>1} B{x|x+a 设全集U=R,A={x|x+1≥0},B={x|x 设全集U=R,集合A={X|-1 设全集U=R,集合A={x|-1 设全集U=R,集合A={x/1 设全集U=R,A={x|-1 设全集U=R,集合A=(x|-1 设全集U=R,集合A={x|-1 设全集U=R,集合A=（X|-1 设全集U=R,A={x|x-1≥0},B={x|1- 设全集U=R,集合A={x丨x>1},B={x丨x+a(要过程) 设全集U=R,集合A={x丨x>1},B={x丨x+a 设全集U=R A=(x|x2)B=(x|-1 设全集U=R,集合A=x|x 设全集U=R,集合A={X|X