分解因式:a2-6ab+9b2=______.
原式=a2-6ab+(3b)2=(a-3b)2,
故答案为(a-3b)2.
My mother will take me to the movie if she free this weekend.[ ]
A. is
B. will be
C. was
D. would be
中央银行可采取的稳健货币政策措施是( )。
A.改革存款准备金制度
B.上调利率
C.下调利率
D.再贷款