1编号：29867题型：单选题测试正确率：68.67%
Thousands of houses by the floods in Guangxi last month.
2编号：29866题型：单选题测试正确率：75.07%
—Have you heard of Earth Day?—Yes.The first Earth Day in 1970 to educate us to protect our planet.
3编号：29865题型：单选题测试正确率：80.72%
Last year, Shenzhou-8 into the space. It made us proud.
4编号：29864题型：单选题测试正确率：58.48%
—Mum, can I go to the zoo with Linda?—When your homework , you can.
5编号：29863题型：单选题测试正确率：68.58%
LadyGaga is very popular, and she by many boys and girls at school.
6编号：29862题型：单选题测试正确率：74.24%
Today,computers are really helpful. They everywhere.
7编号：29861题型：单选题测试正确率：50.0%
已知:线段OA⊥OB,点C为OB中点,D为线段OA上一点.连接AC,BD交于点P.(3)如图3,把题目中“点C为OB中点”改为“BC:CO=1:n”,当AD:DO=1:m时,求的值.解题思路:类比第1题,第2题,过点D作DE∥OB交AC于点E,则AE和CE的数量关系是 ,EP和CP的数量关系是 ,的值是 .以上横线处,依次所填正确的是( )
8编号：29860题型：单选题测试正确率：16.67%
已知:线段OA⊥OB,点C为OB中点,D为线段OA上一点.连接AC,BD交于点P.(2)如图2,当AD:DO=1:m时,求的值;解题思路:类比第1题,过点D作DE∥OB交AC于点E,则AE和CE的数量关系是 ,EP和CP的数量关系是 ,的值是 .以上横线处,依次所填正确的是( )
9编号：29859题型：单选题测试正确率：42.86%
已知:线段OA⊥OB,点C为OB中点,D为线段OA上一点.连接AC,BD交于点P.(1)如图1,当D为OA中点时,求的值;解题思路:(1)尝试探究:在图1中,过点D作DE∥OB交AC于点E,则AE和CE的数量关系是 ,EP和CP的数量关系是 ,的值是 .以上横线处,依次所填正确的是( )
10编号：29848题型：单选题测试正确率：49.7%
类比延伸:把图(2)中的正方形都换成矩形,如图(3),且DA:AB=HA:AE=m:n,请探究HD:GC:EB的值. 解题思路:类比第2题,可证△ADH和△ABE的关系是 ,则HD:EB= ;其次,连接AC,AG,则△ABC和△AEG的关系是 ,则△AGC和△AEB的关系是 ,则GC:EB= ;最后,HD:GC:EB= . 以上横线处,依次所填正确的是( ) ①相似;②全等;③m:n;④n:m;⑤;⑥;⑦;⑧
提醒:
的值.
;⑥
;⑦
;⑧