题型:问答题 简答题 --- Has your uncle ever been to Tibet ? ---___________________________.A. No, he didn't B. No, he haven't C. No, never 查看答案
题型:问答题 简答题 在R上定义运算:xy=x(1-y).若对任意x>2,不等式(x-a)x≤a+2都成立,则实数a的取值范围是( )A.[-1,7]B.(-∞,3]C.(-∞,7]D.(-∞,-1]∪[7,+∞) 查看答案