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.矩形ABCD沿对角线BD折叠，点C落在点F，若AB=2，BC=4，则BE的长是（ ）
A:  |
B:  |
| C: 2 |
| D: 1 |
一次做对，真牛！
+5奖励规则>
- 提示1：IOeUseaKmOWPoOaAp+i0qOWSjOefqeW9oueahOaAp+i0qOWPr+efpe+8jOKIoEVCRD3iiKBDQkQ94oigRURC77yM5Y2z4pazQkRF5Li6562J6IWw5LiJ6KeS5b2i
- 提示2：IOiuvkJFPXjvvIzliJlBRT00LXjvvIzmiorpl67popjovazljJbliLBSdOKWs0FCReS4re+8jOeUseWLvuiCoeWumueQhuaxguinow==
- 答案：QQ==
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
本课配套习题挑战模式2/5
单选题
难度系数：
2.
折叠矩形纸片ABCD，先折出折痕（对角线）BD，再折叠AD边与对角线BD重叠，得折痕DG，若AB=2BC=2，则AG的长为（ ）
| A:
|
| B:
|
| C:
|
| D:
|
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+6aaW5YWI6K6+QeS4jkXph43lkIjvvIzov57mjqVFR++8jOeUseWbm+i+ueW9okFCQ0TmmK/nn6nlvaLvvIxBQj0yQkM9Mu+8jOagueaNruWLvuiCoeWumueQhu+8jOWNs+WPr+axguW+l0JE55qE6ZW/PC9wPjxkaXY+PGltZyBzdHlsZT0id2lkdGg6IDE2NHB4OyBoZWlnaHQ6IDEwNHB4OyIgYWx0PSIiIGRhdGEtY2tlLXNhdmVkLXNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvMjcvMjIvckJBQ0UxTU81Ukh6cTRqd0FBQVNDV2dfa293NTQyLnBuZyIgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC8yNy8yMi9yQkFDRTFNTzVSSHpxNGp3QUFBU0NXZ19rb3c1NDIucG5nIj48L2Rpdj4=
- 提示2：PHA+55Sx5oqY5Y+g55qE5oCn6LSo77yM6K6+QUc9eO+8jOWImUdFPUFHPXjvvIzlnKjilrNCR0XkuK3vvIznlLHli77ogqHlrprnkIbliJfmlrnnqIs8L3A+
- 答案：RA==
PGRpdj7op6PvvJrorr5B5LiORemHjeWQiO+8jOi/nuaOpUVH77yMPGJyPuKIteWbm+i+ueW9okFCQ0TmmK/nn6nlvaLvvIw8YnI+4oi0QUQ9QkM9REU9Me+8jOKIoEJBRD05MMKw77yMPGJyPuWcqOebtOinkuKWs0FCROS4re+8jEJEPTxpbWcgaGVpZ2h0PSIyMSIgd2lkdGg9IjExMSIgZGF0YS1ja2Utc2F2ZWQtc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC8wMC83NC9yQkFDRkZNTVhETGpjc3U4QUFBQ2dsSzVCNWczMTQucG5nIiBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzAwLzc0L3JCQUNGRk1NWERMamNzdThBQUFDZ2xLNUI1ZzMxNC5wbmciPjwvZGl2PjxkaXY+6K6+QUc9eO+8jOWImUdFPUFHPXguPGJyPuWcqOKWs0JHReS4re+8jEJFPUJELURFPTxpbWcgaGVpZ2h0PSIyMSIgd2lkdGg9IjQxIiBkYXRhLWNrZS1zYXZlZC1zcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzIzLzYyL3JCQUNFMU1NWERMQ0VHckRBQUFCb0djMmY0bzY5Ni5wbmciIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvMjMvNjIvckJBQ0UxTU1YRExDRUdyREFBQUJvR2MyZjRvNjk2LnBuZyI+77yMQkc9Mi14LjwvZGl2PjxkaXY+5qC55o2u5Yu+6IKh5a6a55CG5Y+v5b6X77yaPGltZyBoZWlnaHQ9IjIxIiB3aWR0aD0iNTkiIGRhdGEtY2tlLXNhdmVkLXNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvMjMvNjIvckJBQ0UxTU1YRExpYXZvRUFBQUNBbFJ3T1hROTg0LnBuZyIgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC8yMy82Mi9yQkFDRTFNTVhETGlhdm9FQUFBQ0FsUndPWFE5ODQucG5nIj4reDxzdXA+Mjwvc3VwPj3vvIgyLXjvvIk8c3VwPjI8L3N1cD7vvIw8L2Rpdj48ZGl2Puino+W+l++8mng9PGltZyBoZWlnaHQ9IjQyIiB3aWR0aD0iMjUiIGRhdGEtY2tlLXNhdmVkLXNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvMDAvNzQvckJBQ0ZGTU1YREtoTHk3WEFBQUJrekVmZlVJNzM3LnBuZyIgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC8wMC83NC9yQkFDRkZNTVhES2hMeTdYQUFBQmt6RWZmVUk3MzcucG5nIj48L2Rpdj48ZGl2PuKItEFHPTxpbWcgaGVpZ2h0PSI0MiIgd2lkdGg9IjI1IiBkYXRhLWNrZS1zYXZlZC1zcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzAwLzc0L3JCQUNGRk1NWERLaEx5N1hBQUFCa3pFZmZVSTczNy5wbmciIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvMDAvNzQvckJBQ0ZGTU1YREtoTHk3WEFBQUJrekVmZlVJNzM3LnBuZyI+PC9kaXY+PGRpdj48aW1nIHN0eWxlPSJ3aWR0aDogMTY0cHg7IGhlaWdodDogMTA0cHg7IiBhbHQ9IiIgZGF0YS1ja2Utc2F2ZWQtc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC8yNy8yMi9yQkFDRTFNTzVSSHpxNGp3QUFBU0NXZ19rb3c1NDIucG5nIiBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzI3LzIyL3JCQUNFMU1PNVJIenE0andBQUFTQ1dnX2tvdzU0Mi5wbmciPjwvZGl2Pg==
本课配套习题挑战模式3/5
单选题
难度系数：
3.如图，矩形纸片ABCD中，AB=4，AD=3，折叠纸片使AD边与对角线BD重合，则折痕DG的长为（ ）
| A: |
B:  |
C:  |
D:  |
一次做对，真牛！
+5奖励规则>
- 提示1：IOmmluWFiOiuvkFHPXjvvIznlLHnn6nlvaLnurjniYdBQkNE5Lit77yMQUI9NO+8jEFEPTPvvIzlj6/msYLlvpdCROeahOmVvw==
- 提示2：IOWPiOeUseaKmOWPoOeahOaAp+i0qO+8jOWPr+axguW+l0HigLJC55qE6ZW/77yM54S25ZCO55Sx5Yu+6IKh5a6a55CG5Y+v5b6X5pa556iL77yaeDxzdXA+Mjwvc3VwPisyPHN1cD4yPC9zdXA+Pe+8iDQteO+8iTxzdXA+Mjwvc3VwPg==
- 提示3：IOino+aWueeoi+WNs+WPr+axguW+l0FH55qE6ZW/77yM57un6ICM5rGC5b6X562U5qGI
- 答案：Qw==
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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，将矩形沿AE折叠，使D落在BC上的点F处，AB=8，BC=10，则EC的长是
（ ）
| A: 2 |
| B: 3 |
| C: 4 |
| D: 5 |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+5qC55o2u55+p5b2i55qE5oCn6LSo5b6X5YiwQUQ9QkM9MTDvvIxEQz1BQj04PC9wPg==
- 提示2：PHA+5YaN5qC55o2u5oqY5Y+g55qE5oCn6LSo5b6XQUQ9QUY9MTDvvIxERT1FRu+8jOWcqFJ04pazQUJG5Lit5Yip55So5Yu+6IKh5a6a55CG5Y+v6K6h566X5Ye6QkY9Nu+8jOWImUZDPTTvvIw8L3A+
- 提示3：PHA+6K6+RUM9eO+8jOWImURFPUVGPTgteO+8jOagueaNruWLvuiCoeWumueQhuWIl+aWueeoi+axguino+WPr+W+lzwvcD4=
- 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，矩形ABCD中，AB=12cm，BC=24cm，如果将该矩形沿对角线BD折叠，那么图中阴影部分的面积（ ）cm2.
| A: 72 |
| B: 90 |
| C: 108 |
| D: 144 |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+55Sx5oqY5Y+g5b6X5Yiw4pazQkNE4omM4pazQkPigLJE77yM55Sx55+p5b2iQUJDROW+l+WIsOKWs0FCROKJjOKWs0NEQu+8jOWPr+W+l+WHuuKWs0FCROKJjOKWs0PigLJEQjwvcD4=
- 提示2：PHA+5Yip55So5YWo562J5LiJ6KeS5b2i55qE5a+55bqU6KeS55u4562J5b6X5Yiw4oigQ+KAskJEPeKIoEFEQu+8jOWIqeeUqOetieinkuWvueetiei+ueW+l+WIsEVCPUVEPC9wPg==
- 提示3：PHA+5Yip55SoQUFT5b6X5Yiw4pazQUJF4omM4pazQ+KAskRF77yM5Yip55So5YWo562J5LiJ6KeS5b2i55qE5a+55bqU6L6555u4562J5b6X5YiwQUU9Q+KAskXvvIzorr5BRT1D4oCyRT14Y23vvIzliJnmnIlFRD1BRC1BRT3vvIgyNC1477yJY23vvIzliJfmlrnnqIvmsYLop6Plj6/lvpc8L3A+
- 答案：Qg==
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
