11.
分解因式:________________.
10. 如图,等边三角形ABC的边长为4厘米,长为1厘米的线段MN在△ABC的边AB上沿AB方向以1厘米/秒的速度向B点运动(运动开始时,点M与点A重合,点N到达点B时运动终止),过点M、N分别作AB边的垂线,与△ABC的其它边交于P、Q两点.线段MN在运动的过程中,四边形MNQP的面积为S,运动的时间为t.则大致反映S与t变化关系的图象是································································································· ( )
9. 如图所示,将一张正方形纸片对折两次,然后在上面打3个洞,则纸片展开后是( )
8. 为了求的值,
可令S=,
则2S=
,
因此2S – S=,所以
=
,
仿照以上推理计算出的值是············································ ( )
A. B.
C.
D.
7. 在同一直角坐标系中,函数和函数
(m是常数,且
)的图象可能是 ( )
A. B. C. D.
6.
若分式的值为零,则 x 的值等于······················································ ( )
A.2 B. C.
或
D.
5.
函数的自变量
的取值范围是························································· ( )
A. B.
C. D.
且
4. 下列图形中,既是轴对称图形又是中心对称图形的是········································· ( )
A. B. C. D.
3.重庆奥体中心体育场长312米、宽80米的弧形挑棚居亚洲之最,使其成为重庆市一座标志性体育建筑,其建筑面积共62800 .请用科学计数法表示该建筑面积(保留两位有效数字)是 ( )
A. B.
C.
D.
2.
计算的结果是·························································································· ( )
A. B.
C.
D.
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