解:原式=﹣4+4+3+1+2
=6.
下列因式分解中正确的是( )
——I can hardly believe my eyes. Is that you, Lucy?——Yes. It has been almost 20 years______ we were together.
东北地区以 气候为主( )
H/2 的刻度线,表示的容积示数是( )