中学生网络课堂本课配套习题挑战模式1/5
单选题
难度系数：
1.如图，△ABC中，DE∥BC，DE=1，AD=2，DB=3，则BC的长是（ ）
A:  |
B:  |
C:  |
D:  |
一次做对，真牛！
+5奖励规则>
- 提示1：IOagueaNrkRF4oilQkPvvIzor4HmmI7ilrNBREXiiL3ilrNBQkPvvIznhLblkI7moLnmja7lr7nlupTovrnmiJDmr5TkvovmsYLlvpdCQ+eahOmVv+W6pi4=
- 答案：Qw==
6Kej562U77ya4oi1REXiiKVCQ++8jDxicj7iiLTilrNBREXiiL3ilrNBQkPvvIw8YnI+5YiZPGltZyB3aWR0aD02NSBoZWlnaHQ9NDIgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC80QS8wQi9yQkFDRTFQSTdYdkFSclNvQUFBQ1NpWTRpMHc5MzcucG5nIj7vvIw8YnI+4oi1REU9Me+8jEFEPTLvvIxEQj0z77yMPGJyPuKItEFCPUFEK0RCPTXvvIw8YnI+4oi0QkM9PGltZyB3aWR0aD02MCBoZWlnaHQ9NDIgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC8wQy9GNy9yQkFDRkZQSTdYdkFIcGk0QUFBQjRDWnBPSWM0OTEucG5nIj4uIDxicj7mlYXpgIlDLiA=
本课配套习题挑战模式2/5
单选题
难度系数：
2.
如图，在平行四边形ABCD中，点E在AD上，连接CE并延长与BA的延长线交于点F，若AE=2ED，CD=3cm，则AF的长为（ ）
| A: 5cm |
| B: 6cm |
| C: 7cm |
| D: 8cm |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+55Sx6L655b2iQUJDROaYr+W5s+ihjOWbm+i+ueW9ou+8jOWPr+W+l0FC4oilQ0TvvIzljbPlj6/or4HlvpfilrNBRkXiiL3ilrNERUPvvIznhLblkI7nlLHnm7jkvLzkuInop5LlvaLnmoTlr7nlupTovrnmiJDmr5TkvovvvIzmsYLlvpfnrZTmoYguPC9wPg==
- 答案：Qg==
PHA+6Kej77ya4oi15Zub6L655b2iQUJDROaYr+W5s+ihjOWbm+i+ueW9ou+8jDxicj7iiLRBQuKIpUNE77yMPGJyPuKItOKWs0FGReKIveKWs0RFQ++8jDxicj7iiLRBRe+8mkRFPUFG77yaQ0TvvIw8YnI+4oi1QUU9MkVE77yMQ0Q9M2Nt77yMPGJyPuKItEFGPTJDRD02Y20uPGJyPuaVhemAiUIuPC9wPg==
本课配套习题挑战模式3/5
单选题
难度系数：
3.
如图，△ABC中，AE交BC于点D，∠C=∠E，AD=4，BC=8，BD：DC=5：3，则DE的长等于（ ）
| A:
|
| B:
|
| C:
|
| D:
|
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+55Sx4oigQURDPeKIoEJERe+8jOKIoEM94oigRe+8jOWPr+W+l+KWs0FEQ+KIveKWs0JERe+8jOeEtuWQjueUseebuOS8vOS4ieinkuW9oueahOWvueW6lOi+ueaIkOavlOS+i++8jOWNs+WPr+axguW+l+etlOahiC48L3A+
- 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，菱形ABCD中，点M，N在AC上，ME⊥AD，NF⊥AB. 若NF=NM=2，ME=3，则AN=（ ）
| A: 3 |
| B: 4 |
| C: 5 |
| D: 6 |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+5qC55o2u6I+x5b2i55qE5a+56KeS57q/5bmz5YiG5LiA57uE5a+56KeS5Y+v5b6X4oigMT3iiKAy77yM54S25ZCO5rGC5Ye64pazQUZO5ZKM4pazQUVN55u45Ly877yM5YaN5Yip55So55u45Ly85LiJ6KeS5b2i5a+55bqU6L655oiQ5q+U5L6L5YiX5Ye65rGC6Kej5Y2z5Y+vLjwvcD4=
- 答案：Qg==
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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，在△ABC中，AB=AC=a，BC=b（a＞b）. 在△ABC内依次作∠CBD=∠A，∠DCE=∠CBD，∠EDF=∠DCE. 则EF等于（ ）
| A:
|
| B:
|
| C:
|
| D:
|
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+5L6d5qyh5Yik5a6a4pazQUJD4oi94pazQkRD4oi94pazQ0RF4oi94pazREZF77yM5qC55o2u55u45Ly85LiJ6KeS5b2i55qE5a+55bqU6L655oiQ5q+U5L6L55qE55+l6K+G77yM5Y+v5b6X5Ye6RUbnmoTplb/luqYuPC9wPg==
- 答案：Qw==
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
