中学生网络课堂
初三数学 (苏教版下册)
二次函数综合
本课配套习题挑战模式1/5
单选题
难度系数：
1.如图，二次函数y=ax2+2ax+4的图象与x轴交于点A、B，与y轴交于点C，∠CBO的正切值是2. 动直线
从与直线AC重合的位置出发，绕点A顺时针旋转，与直线AB重合时终止运动，直线与BC交于点D，P是线段AD的中点. 点P所经过的路线长是（ ）. 
从与直线AC重合的位置出发，绕点A顺时针旋转，与直线AB重合时终止运动，直线与BC交于点D，P是线段AD的中点. 点P所经过的路线长是（ ）. A: 2 |
B:  |
C:  |
D:  |
一次做对，真牛！
+5奖励规则>
- 提示1：IOWFiOS7pHg9MOaxguWHuk9D55qE6ZW/5bqm77yM5YaN5Yip55So4oigQ0JP5q2j5YiH5YC85rGC5Ye6T0LnmoTplb/luqbvvIzliKnnlKjli77ogqHlrprnkIbliJflvI/msYLlh7pCQ++8jOWGjeWIpOaWreWHuueCuVDnu4/ov4fnmoTot6/nur/kuLrilrNBQkPnmoTkuK3kvY3nur/vvIznhLblkI7moLnmja7kuInop5LlvaLnmoTkuK3kvY3nur/lubPooYzkuo7nrKzkuInovrnlubbkuJTnrYnkuo7nrKzkuInovrnnmoTkuIDljYrop6PnrZTvvJs=
- 答案：Qg==
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
本课配套习题挑战模式2/5
单选题
难度系数：
2.如图，在平面直角坐标系中，四边形OABC是菱形，点C的坐标为（4，0），∠AOC=60°，垂直于x轴的直线l从y轴出发，沿x轴正方向以每秒1个单位长度的速度向右平移，设直线l与菱形OABC的两边分别交于点M，N（点M在点N的上方），若△OMN的面积为S，直线l的运动时间为t秒（0≤t≤4），则能大致反映S与t的函数关系的图象是（ ）
A:  |
B:  |
C:  |
D:  |
一次做对，真牛！
+5奖励规则>
- 提示1：IOi/h0HkvZxBSOKKpXjovbTkuo5I77yM5qC55o2u5Yu+6IKh5a6a55CG5ZKM5ZCrMzDluqbop5LnmoTnm7Top5LkuInop5LlvaLnmoTmgKfotKjmsYLlh7pBSO+8jOagueaNruS4ieinkuW9oueahOmdouenr+WNs+WPr+axguWHuuetlOahiC4=
- 答案：Qw==
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
本课配套习题挑战模式3/5
单选题
难度系数：
3.如图所示，在平面直角坐标系中，四边形OABC为梯形，且OA=AB=BC=4，∠AOC=60°，A、B两点坐标分别是（2,2
）、（6，2），垂直于x轴的直线l从y轴出发，沿x轴正方向以每秒1个单位长度的速度运动（运动到点C为止）。若直线l运动时间为t秒，它在梯形内扫过的面积为S，则S和t的函数关系式为（）. 
）、（6，2），垂直于x轴的直线l从y轴出发，沿x轴正方向以每秒1个单位长度的速度运动（运动到点C为止）。若直线l运动时间为t秒，它在梯形内扫过的面积为S，则S和t的函数关系式为（）. A:  |
B:  |
C:  |
D:  |
一次做对，真牛！
+5奖励规则>
- 提示1：IOe7k+WQiEHjgIFC5Lik54K55Z2Q5qCH5YiG57G76K6o6K6677yM5YiG5Yir5a+55b2TMOKJpHTiiaQy5pe277yM5Lul5Y+K5b2TMu+8nHTiiaQ25pe25ZKM5b2TNu+8nHTiiaQ45pe26L+b6KGM5YiG5p6Q5b6X5Ye65Ye95pWw5YWz57O75byP5Y2z5Y+vLg==
- 答案：Qg==
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
本课配套习题挑战模式4/5
单选题
难度系数：
4.如图，在平面直角坐标系中，四边形OABC是矩形，点B的坐标为（4，3）. 平行于对角线AC的直线m从原点O出发，沿x轴正方向以每秒1个单位长度的速度运动，设直线m与矩形OABC的两边分别交于点M、N，直线m运动的时间为t（秒），设△OMN的面积为S，则S与t的函数关系式为（）。
A:  |
B:  |
C:  |
D:  |
一次做对，真牛！
+5奖励规则>
- 提示1：IOW9k+ebtOe6v23lnKhBQ+S4i+aWueaIluS4jkFD6YeN5ZCI5pe277yM5Y2z5b2TMO+8nHTiiaQ05pe277yM5qC55o2u5bmz6KGM5b6X5Yiw5Lik5a+55ZCM5L2N6KeS55qE55u4562J5Y+v6K+B4pazT01O4oi94pazT0FD77yM55So5Lik5LiJ6KeS5b2i55qE55u45Ly85q+U5rGC5Ye66Z2i56ev5q+U77yM5Y2z5Y+v5b6X5Ye6U+S4jnTnmoTlh73mlbDlhbPns7vlvI8u
- 提示2：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
- 答案：QQ==
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
本课配套习题挑战模式5/5
单选题
难度系数：
5.如图，已知直线l的解析式为y=-x+6，直线l与x轴、y轴分别相交于A（6,0）、B（6，0）两点，平行于直线l的直线n从原点出发，沿x轴正方向以每秒1个单位长度的速度运动，设运动时间为t秒，运动过程中始终保持n∥l，当直线n与直线l重合时，运动结束. 直线n与x轴，y轴分别相交于C、D两点，以线段CD的中点P为圆心、CD为直径，在CD上方作半圆，半圆面积为S. 直线n在运动过程中，S与t的函数关系式S＝
t2(0＜t≤6)，当半圆面积S=S梯形ABCD时，可得t的值为（ ）。
t2(0＜t≤6)，当半圆面积S=S梯形ABCD时，可得t的值为（ ）。 | A: 2 |
| B: 4 |
C: 3 |
| D: 2 |
一次做对，真牛！
+5奖励规则>
- 提示1：IFM8c3ViPuair+W9ojwvc3ViPjxzdWI+QUJDRDwvc3ViPj1TPHN1Yj7ilrM8L3N1Yj48c3ViPkFPQjwvc3ViPi1TPHN1Yj7ilrM8L3N1Yj48c3ViPkNPRDwvc3ViPuS7peWPilM9PGltZyB3aWR0aD03IGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzY0LzREL3JCQUNGRk9XbFI3eXplMHBBQUFCUHlZZmMzYzM5NS5wbmciPlM8c3ViPuair+W9ojwvc3ViPjxzdWI+QUJDRDwvc3ViPu+8jOaxguWHuuWNs+WPry4=
- 答案：RA==
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
