已知R为全集,A={x丨log1/2(3-x)≤2},B={x丨5/x+2≥1} ,求补集Cr(A∩B),
问题描述:
已知R为全集,A={x丨log1/2(3-x)≤2},B={x丨5/x+2≥1} ,求补集Cr(A∩B),
答
A:(3-x)≥0.25,x≤2.75
B:(x+5)/x≥0,x≤-5或x>0
A∩B:x≤-5或0