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.
如图是一个平行四边形，图中甲部分面积是15平方厘米，乙部分的面积占整个平行四边形面积的30%. 则平行四边形的面积为（ ）平方厘米.
| A: 35 |
| B: 40 |
| C: 50 |
| D: 60 |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+6KeC5a+f5Zu+5b2i5Y+v55+l77yM5Zug5Li65bmz6KGM5Zub6L655b2i55qE5LiA5p2h5a+56KeS57q/5oqK5bmz6KGM5Zub6L655b2i5YiG5oiQ5Lik5Liq6Z2i56ev55u4562J55qE5LiJ6KeS5b2i77yM5LiN6Zq+5b6X5Ye655Sy5LiO5LmZ55qE6Z2i56ev55u4562J77yM5Y+I5Zug5Li65LmZ6YOo5YiG55qE6Z2i56ev5Y2g5pW05Liq5bmz6KGM5Zub6L655b2i6Z2i56ev55qEMzAlLiDliJkzMCXlr7nlupTnmoTmlbDlgLzmmK8xNeW5s+aWueWOmOexs++8jOaJgOS7peWPr+axguWHuuW5s+ihjOWbm+i+ueW9oueahOmdouenr+aYrzE1w7czMCU9NTDlubPmlrnljpjnsbMuPC9wPg==
- 答案：Qw==
PHA+6Kej77ya5bmz6KGM5Zub6L655b2i5a+56KeS57q/5YiG5oiQ55qE5Lik5Liq5LiJ6KeS5b2i6Z2i56ev55u4562J77yM5YiZ5ZCM5LiA5bqV5LiK55qE6auY55u4562J77yM5qC55o2u562J5bqV562J6auY5b6X5Ye677ya55Sy5LiO5LmZ55qE6Z2i56ev55u4562J77yMPGJyPuaJgOS7peW5s+ihjOWbm+i+ueW9oueahOmdouenr+aYrzE1w7czMCU9NTDvvIjlubPmlrnljpjnsbPvvInvvIw8L3A+
本课配套习题挑战模式2/5
单选题
难度系数：
2.如图1，AD是
的斜边BC上的高，且
，AB＝45，AD的长为（ ）
的斜边BC上的高，且，AB＝45，AD的长为（ ） | A: 30 |
| B: 36 |
| C: 40 |
| D: 32 |
一次做对，真牛！
+5奖励规则>
- 提示1：IEFDw5dBQj1CQ8OXQUQ=
- 答案：Qg==
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
本课配套习题挑战模式3/5
单选题
难度系数：
3.
已知四边形ABCD是长方形，三角形ABE中的点E可以在线段CD上移动，如果E点移动到F上，三角形ABE和三角形ABF的面积分别为甲和乙，那么它们的大小关系是（ ）
| A: 甲＜乙 |
| B: 甲＞乙 |
| C: 甲=乙 |
| D: 无法确定 |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+5Zu+5Lit4pazQUJF5LiO4pazQUJG55qE5bqV5piv5ZCM5LiA5Liq5bqVQULvvIzpq5jkuZ/nm7jnrYnpg73mmK/plb/mlrnlvaJBQkNE55qE5a6977yM5omA5Lul5a6D5Lus55qE6Z2i56ev5Lmf5piv55u4562J55qELiDmiJHku6zlj6/ku6XnlLvlm77ov5vooYzop6PnrZQuPC9wPg==
- 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.
如图所示，在长方形ABCD中，△ABE、△ADF和四边形AECF的面积都相等，且BE=8，则EC的长为（ ）
| A: 2 |
| B: 3 |
| C: 4 |
| D: 5 |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+6L+e5o6lQUPvvIzmoLnmja7plb/mlrnlvaLnmoTlr7nop5Lnur/nmoTnibnngrnlj6/lvpfvvJrilrNBQkPlkozilrNBREPnmoTpnaLnp6/nm7jnrYnvvIzmmK/ov5nkuKrplb/mlrnlvaLpnaLnp6/nmoTkuIDljYrvvJs8L3A+
- 提示2：PHA+5Y+I5Zug5Li677yM4pazQUJF44CB4pazQURG5ZKM5Zub6L655b2iQUVDRueahOmdouenr+mDveebuOetie+8jOaJgOS7peWPr+W+l++8muKWs0FFQ+eahOmdouenr+aYr+Wbm+i+ueW9okFFQ0bnmoTpnaLnp6/nmoTkuIDljYrvvIzkuZ/mmK/ilrNBQkXnmoTkuIDljYrvvIzljbPvvJrilrNBQkXnmoQg6Z2i56ev77ya4pazQUNF55qE6Z2i56evPTLvvJox77yM5Yip55So6auY5LiA5a6a5pe277yM5LiJ6KeS5b2i55qE6Z2i56ev5LiO5bqV5oiQ5q2j5q+U55qE5oCn6LSo5Y2z5Y+v5b6X5Ye6QkXvvJpFQz0y77yaMe+8jOeUseatpOWNs+WPr+axguW+l0VD55qE6ZW/5bqmLjwvcD4=
- 答案：Qw==
PHA+6Kej77ya6L+e5o6lQUPvvIzmoLnmja7popjlubLliIbmnpDlj6/lvpfvvJo8YnI+4pazQUJF55qE6Z2i56ev77ya4pazQUNF55qE6Z2i56evPTLvvJox77yMPGJyPuaJgOS7pe+8mkJF77yaRUM9Mu+8mjHvvIw8YnI+5Y+I5Zug5Li6QkU9OOWOmOexs++8jDxicj7miYDku6VFQz04w7cyPTTvvIjljpjnsbPvvInvvJs8YnI+5pWF6YCJ77yaQy48YnI+PGltZyBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwL0E1LzdFL3JCQUNFMU9aY3EtUVRoakFBQUFZUnhpcldOQTY2Mi5wbmciIGRhdGEtY2tlLXNhdmVkLXNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvQTUvN0UvckJBQ0UxT1pjcS1RVGhqQUFBQVlSeGlyV05BNjYyLnBuZyIgaGVpZ2h0PSIxMDgiIHdpZHRoPSIxNzAiPjwvcD4=
本课配套习题挑战模式5/5
单选题
难度系数：
5.
如图，三角形ADF与三角形ABE、四边形AFCE的面积相等，BC=9厘米，CD=6厘米，求阴影部分的面积（ ）
| A: 5（平方厘米） |
| B: 25（平方厘米） |
| C: 15（平方厘米） |
| D: 10（平方厘米） |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+5Zug5Li6UzxzdWI+4pazQURGPC9zdWI+PVM8c3ViPuKWs0FCRTwvc3ViPj1TPHN1Yj5BRkNFPC9zdWI+77yM6ICM6ZW/5pa55b2i55qE6ZW/5ZKM5a695bey55+l77yM5YiZ6ZW/5pa55b2i55qE6Z2i56ev5Y+v5rGC77yM6ZW/5pa55b2i55qE6Z2i56ev55qEPGltZyBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzY5LzU3L3JCQUNGRk9aY3JXQ0hndXpBQUFCSDBzQkJMZzY0Ni5wbmciIGRhdGEtY2tlLXNhdmVkLXNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvNjkvNTcvckJBQ0ZGT1pjcldDSGd1ekFBQUJIMHNCQkxnNjQ2LnBuZyIgaGVpZ2h0PSI0MiIgd2lkdGg9IjYiPuS5n+WPr+axgu+8jOaJgOS7peWwseiDveaxguWHukJF44CBREbnmoTplb/luqbvvIzov5vogIzlvpfliLBFQ+OAgUZD55qE6ZW/5bqm77yM5Yip55So5LiJ6KeS5b2i55qE6Z2i56ev5YWs5byP5rGC5Ye65LiJ6KeS5b2iQ0VG55qE6Z2i56ev77yM5bCx6IO95rGC5Ye66Zi05b2x6YOo5YiG55qE6Z2i56evLjwvcD4=
- 答案：Qw==
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
