A:He's very funny.
B:I often read books.
将分式方程 1−2xx−1=3x−1 去分母,得到正确的整式方程是( )
北京市的气候类型属于( )
Tony,don't forget your homework to me after school.
如图, 路灯下有一排同样高的旗杆,离路灯越近,旗杆的影子( )
已知抛物线y=ax2+bx+c的开口向下,顶点坐标为(2,-3),那么该抛物线有( )