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，在Rt△ABC中，∠ACB=90°，点D是斜边AB的中点，DE⊥AC，垂足为E，若BC=4，CD=2
，则BE的长为（ ）
| A:
|
| B:
|
| C:
|
| D:
|
一次做对，真牛！
+5奖励规则>
- 提示1：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
- 答案：RA==
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
本课配套习题挑战模式2/5
单选题
难度系数：
2.
在锐角△ABC中，∠BAC=60°，BN、CM为高，P为BC的中点，连接MN、MP、NP，则结论：①NP=MP；②当∠ABC=60°时，MN∥BC；③BN=2AN；④AN：AB=AM：AC，一定正确的有（ ）
| A: 1个 |
| B: 2个 |
| C: 3个 |
| D: 4个 |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+4pGg55SxQk7jgIFDTeS4uumrmO+8jFDkuLpCQ+eahOS4reeCue+8jOagueaNruebtOinkuS4ieinkuW9ouaWnOi+ueS4iueahOS4ree6v+etieS6juaWnOi+ueeahOS4gOWNiu+8jOWNs+WPr+ivgeW+l05QPU1Q77ybPC9wPg==
- 提示2：PHA+4pGh55SxQk7jgIFDTeS4uumrmOS4juKIoEHmmK/lhazlhbHop5LvvIzmmJPor4HlvpfilrNBTU7iiL3ilrNBQkPvvIznhLblkI7nlLHiiKBCQUM9NjDCsOS4juKIoEFCQz02MMKw77yM5Y+v5b6X4pazQUJD5piv562J6L655LiJ6KeS5b2i77yM5YiZ5piT5b6X4oigQU1OPeKIoEFCQz02MMKw77yM5Y2z5Y+v5b6XTU7iiKVCQ++8mzwvcD4=
- 提示3：PHA+4pGi5qC55o2u6ZSQ6KeS5LiJ6KeS5Ye95pWw55qE5a6a5LmJ77yM5Y+v5b6X4pGi6ZSZ6K+v77ybPC9wPg==
- 提示4：PHA+4pGj55Sx4pGh4pazQU1O4oi94pazQUJD77yM5qC55o2u55u45Ly85LiJ6KeS5b2i55qE5a+55bqU6L655oiQ5q+U5L6L77yM5Y2z5Y+v6K+B5b6XQU7vvJpBQj1BTe+8mkFDLjwvcD4=
- 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，△ABC中，BC=18，若BD⊥AC于D，CE⊥AB于E，F、G分别为BC、DE的中点，若ED=10，则FG的长为（ ）
| A:
|
| B: 9 |
| C: 10 |
| D: 无法确定 |
一次做对，真牛！
+5奖励规则>
- 提示1：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
- 答案：QQ==
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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Rt△ABC（其中∠ACB=90°）绕点C顺时针旋转90°得到△DEC，M、N分别为AB、DE的中点，若MN=4，则AB的长为（ ）
| A:
|
| B: 4 |
| C:
|
| D: 8 |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+6L+e5o6lQ03jgIFDTu+8jOagueaNruebtOinkuS4ieinkuW9ouaWnOi+ueS4iueahOS4ree6v+etieS6juaWnOi+ueeahOS4gOWNiu+8jOWPr+S7peW+l+WIsENNPUNO77yM54S25ZCO5YaN6K+B5piOQ03iiqVDTu+8jOWcqOKWs0NNTuS4re+8jOaxguWHukNN55qE6ZW/5bqm77yMQUI9MkNNLjwvcD4=
- 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，∠ABC=∠ADC=90°，E是AC的中点，则（ ）
| A: ∠1＞∠2 |
| B: ∠1=∠2 |
| C: ∠1＜∠2 |
| D: ∠1与∠2大小关系不能确定 |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+5qC55o2u55u06KeS5LiJ6KeS5b2i5pac6L655LiK55qE5Lit57q/562J5LqO5pac6L6555qE5LiA5Y2K77yM5Y+v5Lul6K+B5piOREU9QkXvvIzlho3moLnmja7nrYnohbDkuInop5LlvaLnmoTmgKfotKjljbPlj6/op6PnrZQuPC9wPg==
- 答案：Qg==
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
