Question

不等式(2x+1)/(2-x)≤0的解集是()？

A.(-∞,-1/2)∪(2,+∞)B. (-∞,-1/2]
∪[2,+∞)
C. (-∞,-1/2]∪(2,+∞)D. [-1/2,2)

Answer 1

(2x+1)/(2-x)≤0

(2x+1)/(x-2)≥0
x≤-1/2 or x>2
ans : C (-∞,-1/2]∪(2,+∞)