Did they meet John ? ______ .
A: Yes, they did .
B:No, he didn’t.
C:No, they did .
解方程: 2x−1=1x−1+1 .
已知fx=log12x,x>02x,x≤0,则f-2的值是 ( )
明建国之初,太祖朱元璋鉴于“人君不能恭览庶政,大臣专权自恣(放纵)”的状况,采取的措施是 ( )