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，
,E是BC的中点，BE=2cm,AC=10cm, 则线段DE的长度为（ ）.
| A: 5 |
| B: 6 |
| C: 7 |
| D: 8 |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+5YWI5qC55o2uReaYr0JD55qE5Lit54K577yMQkU9MmNtLEFDPTEwY23vvIzov5nkuKrkv6Hmga/msYLlh7rnur/mrrVBQueahOmVv+W6pjwvcD4=
- 提示2：PHA+5YaN5qC55o2uPGltZyBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzAxL0Q2L3JCQUNGRk1OVmJlUTlxeHFBQUFDQ25MYVFoODYwMC5wbmciIGRhdGEtY2tlLXNhdmVkLXNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvMDEvRDYvckJBQ0ZGTU5WYmVROXF4cUFBQUNDbkxhUWg4NjAwLnBuZyIgaGVpZ2h0PSI0MiIgd2lkdGg9IjY0Ij7vvIzorr7lh7rmgbDlvZPnmoTmnKrnn6XmlbDvvIzmib7nrYnph4/lhbPns7vvvIzlu7rnq4vmlrnnqIs8L3A+
- 答案：Qw==
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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，已知
则
的长度为（ ）
| A: |
| B: 10 |
| C: |
| D: 11 |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+6aKY55uu5L+h5oGv6L6D5aSa77yM5Y+v6K6+Q0LkuLp477yM5LmL5ZCO5YW25LuW55qE57q/5q615Lmf55SoeOadpeihqOekuuWHuuadpTwvcD4=
- 提示2：PHA+5YiG5p6Q5Zu+5b2i5bu656uL5pa556iL77yM5rGC5Ye6eCA7IOWGjeaxgkNE55qE6ZW/PC9wPg==
- 答案：Qg==
PGRpdj7op6PvvJrmoLnmja7popjmhI/orr5DQj14ICwg5YiZIDxpbWcgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC8wMS9ENi9yQkFDRkZNTlZodnpSN0ZBQUFBQzBETS0wMWczNTIucG5nIiBkYXRhLWNrZS1zYXZlZC1zcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzAxL0Q2L3JCQUNGRk1OVmh2elI3RkFBQUFDMERNLTAxZzM1Mi5wbmciIGhlaWdodD0iNDIiIHdpZHRoPSIxMjEiPjwvZGl2PjxkaXY+4oi0QUI9QUMrQ0I9PGltZyBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzI0L0M2L3JCQUNFMU1OVmh1VEItV29BQUFCVVEtbFJuSTMzOC5wbmciIGRhdGEtY2tlLXNhdmVkLXNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvMjQvQzYvckJBQ0UxTU5WaHVUQi1Xb0FBQUJVUS1sUm5JMzM4LnBuZyIgaGVpZ2h0PSI0MiIgd2lkdGg9IjE2Ij54PC9kaXY+PGRpdj7iiLVBQj02NmNtPC9kaXY+PGRpdj7iiLQ8aW1nIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvMjQvQzYvckJBQ0UxTU5WaHVUQi1Xb0FBQUJVUS1sUm5JMzM4LnBuZyIgZGF0YS1ja2Utc2F2ZWQtc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC8yNC9DNi9yQkFDRTFNTlZodVRCLVdvQUFBQlVRLWxSbkkzMzgucG5nIiBoZWlnaHQ9IjQyIiB3aWR0aD0iMTYiPnggPTY2PC9kaXY+PGRpdj7iiLR4PTxpbWcgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC8wMS9ENi9yQkFDRkZNTlZodmhzZDcwQUFBQk5FbXdjUUk0NTMucG5nIiBkYXRhLWNrZS1zYXZlZC1zcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzAxL0Q2L3JCQUNGRk1OVmh2aHNkNzBBQUFCTkVtd2NRSTQ1My5wbmciIGhlaWdodD0iNDIiIHdpZHRoPSIxMiI+PC9kaXY+PGRpdj7iiLRDRD1BQy1BRD08aW1nIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvMjQvQzcvckJBQ0UxTU5WaHV5U0NPakFBQUJaUVBYa3o4MjM3LnBuZyIgZGF0YS1ja2Utc2F2ZWQtc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC8yNC9DNy9yQkFDRTFNTlZodXlTQ09qQUFBQlpRUFhrejgyMzcucG5nIiBoZWlnaHQ9IjQyIiB3aWR0aD0iMTYiPnggPTEwPC9kaXY+PGRpdj7mlYXpgIlCPC9kaXY+
本课配套习题挑战模式3/5
单选题
难度系数：
3.
如图，C是线段AB的中点，D是线段AC的中点，已知图中所有线段的长度之和为23.则线段AC的长度为（ ）
| A: |
| B: 4 |
| C: |
| D: |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+5YWI5pWw57q/5q6177yM5pWw5LiA5LiL5Zu+5Lit55qE5omA5pyJ57q/5q615pyJ5ZOq5LqbPC9wPg==
- 提示2：PHA+5qC55o2u6aKY55uu5Lit5Ye6546w55qEMuS4quS4reeCue+8jOinguWvn+WbvuS4reaJgOaciei/mTbmnaHnur/mrrXkuYvpl7TnmoTmlbDph4/lhbPns7s8L3A+
- 提示3：PHA+5qC55o2u57q/5q615LmL6Ze055qE5pWw6YeP5YWz57O76K6+5pyA5bCP6YeP5Li6eCAs5YiX5Ye65pa556iLPC9wPg==
- 答案：RA==
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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，B,C是线段AD上两点，且AB∶BC∶CD=2∶4∶3,M是AD中点，BM=15cm,则线段MC的长度为（ ） .
| A: 8.5cm |
| B: 9cm |
| C: 9.5cm |
| D: 10cm |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+5qC55o2u5q+U5YC855u45bqU55qE6K6+5pyq55+l5pWw77yM6KGo56S65Zyo5Zu+5b2i5LitPC9wPg==
- 提示2：PHA+6KeC5a+f5Zu+5b2i77yM5Yip55SoPGltZyBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzI0L0M3L3JCQUNFMU1OVmgtRHdDaFhBQUFDUlFrMWtfQTA4My5wbmciIGRhdGEtY2tlLXNhdmVkLXNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvMjQvQzcvckJBQ0UxTU5WaC1Ed0NoWEFBQUNSUWsxa19BMDgzLnBuZyIgaGVpZ2h0PSIyMSIgd2lkdGg9Ijc0Ij7nmoTlt7Lnn6Xkv6Hmga/vvIzmib7nrYnph4/lhbPns7vvvIzlu7rnq4vmlrnnqIs8L3A+
- 提示3：PHA+6Kej5Ye6eOWQju+8jOinguWvn+WbvuW9ou+8jOaxgk1D55qE6ZW/5bqmPC9wPg==
- 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，C,D,E将线段AB分成2∶3∶4∶5四部分，M,P,Q,N分别AC,CD,
DE,EB的中点，且MN=21，则线段PQ的长度为（ ）.
| A: 6 |
| B: 6.5 |
| C: 7 |
| D: 7.5 |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+5qC55o2u5q+U5YC86K6+5Ye65pyq55+l5pWweO+8jOihqOekuuWcqOWbvuW9ouS4re+8jOeci01O5oCO5LmI55SoeOihqOekujwvcD4=
- 提示2：PHA+5bu656uL562J6YeP5YWz57O777yM6Kej5Ye6eDvlho3op4Llr59QUeivpeaAjuS5iOeUqHjooajnpLo8L3A+
- 提示3：PHA+5LmL5ZCO5Luj5YWleO+8jOaxguWHulBRPC9wPg==
- 答案：Qw==
PGRpdj7op6PvvJrorr5BQz0yeO+8jOWImUNEPTN477yMREU9NHjvvIxFQj01eO+8jDxicj7kuo7mmK/mnIlNQz1477yMRU49Mi41eO+8jDxicj7nlLHpopjmhI/lvpfvvIxNTj1NQytDRCtERStFTj14KzN4KzR4KzIuNXg9MTAuNXg8YnI+5Y2zMTAuNXg9MjHvvIw8YnI+5omA5LuleD0y77yMPGJyPue6v+autVBR55qE6ZW/5bqmPTAuNUNEKzAuNURFPTEuNXgrMng9My41eD03Ljxicj7mlYXnrZTmoYjkuLpDLjwvZGl2Pg==
