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.
园丁住宅小区有一块草坪如图所示. 已知AB=3米，BC=4米，CD=12米，DA=13米，且AB⊥BC，这块草坪的面积是（ ）平方米
| A: 24 |
| B: 36 |
| C: 48 |
| D: 72 |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+6L+e5o6lQUPvvIzlhYjmoLnmja7li77ogqHlrprnkIbmsYLlh7pBQ+eahOmVv++8jOeEtuWQjuWIqeeUqOWLvuiCoeWumueQhueahOmAhuWumueQhuivgeaYjuKWs0FDROS4uuebtOinkuS4ieinkuW9oi4g5LuO6ICM55So5rGC5ZKM55qE5pa55rOV5rGC6Z2i56evPC9wPg==
- 答案：Qg==
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
本课配套习题挑战模式2/5
单选题
难度系数：
2.以下列各组数为边长，能构成直角三角形的是（ ）
A:  |
B:  |
C:  |
| D: 1，2，3 |
一次做对，真牛！
+5奖励规则>
- 提示1：IOeUqOWLvuiCoeWumueQhueahOmAhuWumueQhui/m+ihjOWIpOaWre+8jOeci+i+g+efreS4pOi+ueeahOW5s+aWueWSjOaYr+WQpuetieS6jumVv+i+ueeahOW5s+aWueWNs+WPrw==
- 答案：QQ==
PGRpdj7op6PvvJo8aW1nIHdpZHRoPTE0MyBoZWlnaHQ9NDIgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC8yMy81Ri9yQkFDRTFNTVd1R2c0MTNhQUFBRERVeklVRkUxNTMucG5nIj7vvIzlhbbkvZnpgInpobnkuI3nrKblkIjli77ogqHlrprnkIY8L2Rpdj4=
本课配套习题挑战模式3/5
单选题
难度系数：
3.下列说法中不正确的是（ ）
| A: 三个角度之比为3：4：5的三角形是直角三角形 |
| B: 三边之比为3：4：5的三角形是直角三角形 |
| C: 三个角度之比为1：2：3的三角形是直角三角形 |
D: 三边之比为1：2： 的三角形是直角三角形 |
一次做对，真牛！
+5奖励规则>
- 提示1：IOagueaNruebtOinkuS4ieinkuW9oueahOWIpOWumuaWueazleWvueWQhOS4qumAiemhuei/m+ihjOWIhuaekA==
- 答案：QQ==
PGRpdj7op6PvvJpB5LiN5q2j56Gu77yM5Zug5Li65qC55o2u5LiJ6KeS5b2i5YaF6KeS5ZKM5a6a55CG5rGC5b6X5ZCE6KeS55qE5bqm5pWw77yM5YW25Lit5rKh5pyJ55u06KeS77ybPGJyPkLmraPnoa7vvIzlm6DkuLrlhbbkuInovrnnrKblkIjli77ogqHlrprnkIbnmoTpgIblrprnkIbvvJs8YnI+Q+ato+ehru+8jOagueaNruWGheinkuWSjOWFrOW8j+axguW+l+S4ieinkueahOW6puaVsO+8jOacieebtOinku+8mzxicj5E5q2j56Gu77yM5Zug5Li65YW25LiJ6L6556ym5ZCI5Yu+6IKh5a6a55CG55qE6YCG5a6a55CG77ybPC9kaXY+
本课配套习题挑战模式4/5
单选题
难度系数：
4.
某园艺公司对一块直角三角形的花园进行改造，测得两直角边长分别为a=6米，b=8米. 现要将其扩建成等腰三角形，且扩充部分是以b为直角边的直角三角形，则扩建后的等腰三角形花圃的周长为（ ）米.
| A: 32或 |
| B: 32或36或803 |
| C: 32或803 或 |
| D: 32或36或803 或 |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+55Sx5LqO5omp5YWF5omA5b6X55qE562J6IWw5LiJ6KeS5b2i6IWw5ZKM5bqV5LiN56Gu5a6aLOaJgOS7peimgeWIhuexu+iuqOiuujwvcD4=
- 答案：Qw==
PGRpdj7op6PvvJrlpoLlm77miYDnpLrvvJrlnKhSdOKWs0FCQ+S4re+8jDxicj7iiLVBQz04be+8jEJDPTZt77yMPGJyPuKItEFCPTEwbe+8jDwvZGl2PjxkaXY+5aaC5Zu+Me+8jOW9k0FCPUFE5pe277yMQ0Q9QkM9Nm3vvIw8YnI+5q2k5pe2562J6IWw5LiJ6KeS5b2i6Iqx5ZyD55qE5ZGo6ZW/PTEwKzEwKzYrNj0zMu+8iG3vvInvvJs8YnI+5aaC5Zu+Mu+8muW9k0FEPUJE5pe277yM6K6+QUQ9QkQ9eG3vvJs8YnI+UnTilrNBQ0TkuK3vvIxCRD14be+8jENEPe+8iHgtNu+8iW3vvJs8YnI+55Sx5Yu+6IKh5a6a55CG77yM5b6XPGltZyBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzIzLzVGL3JCQUNFMU1NV3QyeWhCY1NBQUFDVmt6Tnh1czU3NC5wbmciIGRhdGEtY2tlLXNhdmVkLXNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvMjMvNUYvckJBQ0UxTU1XdDJ5aEJjU0FBQUNWa3pOeHVzNTc0LnBuZyIgaGVpZ2h0PSIyMSIgd2lkdGg9IjExMyI+6Kej5b6XPGltZyBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzAwLzcwL3JCQUNGRk1NV3QyQVBLeTRBQUFCbTF1bmpBWTQxOC5wbmciIGRhdGEtY2tlLXNhdmVkLXNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvMDAvNzAvckJBQ0ZGTU1XdDJBUEt5NEFBQUJtMXVuakFZNDE4LnBuZyIgaGVpZ2h0PSI0MiIgd2lkdGg9IjM3Ij48L2Rpdj48ZGl2PuatpOaXtuetieiFsOS4ieinkuW9ouiKseWcg+eahOWRqOmVvz08c3BhbiBjbGFzcz0ibWF0aHF1aWxsLXJlbmRlcmVkLW1hdGgiIHN0eWxlPSJmb250LXNpemU6MjBweDsiPjxzcGFuIGNsYXNzPSJ0ZXh0YXJlYSI+PHRleHRhcmVhIGRhdGEtY2tlLWVkaXRhYmxlPSIxIiBjb250ZW50ZWRpdGFibGU9ImZhbHNlIj48L3RleHRhcmVhPjwvc3Bhbj48c3BhbiBjbGFzcz0iZnJhY3Rpb24gbm9uLWxlYWYiIG1hdGhxdWlsbC1jb21tYW5kLWlkPSI0Ij48c3BhbiBjbGFzcz0ibnVtZXJhdG9yIiBtYXRocXVpbGwtYmxvY2staWQ9IjUiPjxzcGFuIG1hdGhxdWlsbC1jb21tYW5kLWlkPSI5Ij4yPC9zcGFuPjxzcGFuIG1hdGhxdWlsbC1jb21tYW5kLWlkPSIxMCI+NTwvc3Bhbj48L3NwYW4+PHNwYW4gY2xhc3M9ImRlbm9taW5hdG9yIiBtYXRocXVpbGwtYmxvY2staWQ9IjYiPjxzcGFuIG1hdGhxdWlsbC1jb21tYW5kLWlkPSIxMSI+Mzwvc3Bhbj48L3NwYW4+PHNwYW4gc3R5bGU9ImRpc3BsYXk6aW5saW5lLWJsb2NrO3dpZHRoOjAiPiZuYnNwOzwvc3Bhbj48L3NwYW4+PHNwYW4gbWF0aHF1aWxsLWNvbW1hbmQtaWQ9IjE2Ij7Dlzwvc3Bhbj48c3BhbiBtYXRocXVpbGwtY29tbWFuZC1pZD0iMTciPjI8L3NwYW4+PHNwYW4gY2xhc3M9ImJpbmFyeS1vcGVyYXRvciIgbWF0aHF1aWxsLWNvbW1hbmQtaWQ9IjE4Ij4rPC9zcGFuPjxzcGFuIG1hdGhxdWlsbC1jb21tYW5kLWlkPSIxOSI+MTwvc3Bhbj48c3BhbiBtYXRocXVpbGwtY29tbWFuZC1pZD0iMjAiPjA8L3NwYW4+PHNwYW4gY2xhc3M9ImJpbmFyeS1vcGVyYXRvciIgbWF0aHF1aWxsLWNvbW1hbmQtaWQ9IjIxIj49PC9zcGFuPjxzcGFuIGNsYXNzPSJmcmFjdGlvbiBub24tbGVhZiIgbWF0aHF1aWxsLWNvbW1hbmQtaWQ9IjIyIj48c3BhbiBjbGFzcz0ibnVtZXJhdG9yIiBtYXRocXVpbGwtYmxvY2staWQ9IjIzIj48c3BhbiBtYXRocXVpbGwtY29tbWFuZC1pZD0iMjYiPjg8L3NwYW4+PHNwYW4gbWF0aHF1aWxsLWNvbW1hbmQtaWQ9IjI3Ij4wPC9zcGFuPjwvc3Bhbj48c3BhbiBjbGFzcz0iZGVub21pbmF0b3IiIG1hdGhxdWlsbC1ibG9jay1pZD0iMjQiPjxzcGFuIG1hdGhxdWlsbC1jb21tYW5kLWlkPSIyOCI+Mzwvc3Bhbj48L3NwYW4+PHNwYW4gc3R5bGU9ImRpc3BsYXk6aW5saW5lLWJsb2NrO3dpZHRoOjAiPiZuYnNwOzwvc3Bhbj48L3NwYW4+PHZhciBtYXRocXVpbGwtY29tbWFuZC1pZD0iMjkiPm08L3Zhcj48L3NwYW4+PHNwYW4+Jm5ic3A7PC9zcGFuPjxicj48L2Rpdj48ZGl2PuW9k0FCPUJE5pe277yM5ZyoUnTilrNBQ0TkuK3vvIw8aW1nIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvMjMvNUYvckJBQ0UxTU1XdDJ4VUdYM0FBQURnV21ocExNMjA3LnBuZyIgZGF0YS1ja2Utc2F2ZWQtc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC8yMy81Ri9yQkFDRTFNTVd0MnhVR1gzQUFBRGdXbWhwTE0yMDcucG5nIiBoZWlnaHQ9IjIxIiB3aWR0aD0iMTc4Ij48YnI+PC9kaXY+PGRpdj7mraTml7bnrYnohbDkuInop5LlvaLoirHlnIPnmoTlkajplb89PGltZyBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzAwLzcwL3JCQUNGRk1NV3QzaGNTajNBQUFDbUdaTjc0NDQyNi5wbmciIGRhdGEtY2tlLXNhdmVkLXNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvMDAvNzAvckJBQ0ZGTU1XdDNoY1NqM0FBQUNtR1pONzQ0NDI2LnBuZyIgaGVpZ2h0PSIyMSIgd2lkdGg9IjE1NiI+77yIbe+8iTwvZGl2PjxkaXY+5omA5Lul57u85LiK5omA6L+w77yM5ZGo6ZW/5Li6MzLmiJY8c3BhbiBjbGFzcz0ibWF0aHF1aWxsLXJlbmRlcmVkLW1hdGgiIHN0eWxlPSJmb250LXNpemU6MjBweDsiPjxzcGFuIGNsYXNzPSJ0ZXh0YXJlYSI+PHRleHRhcmVhIGRhdGEtY2tlLWVkaXRhYmxlPSIxIiBjb250ZW50ZWRpdGFibGU9ImZhbHNlIj48L3RleHRhcmVhPjwvc3Bhbj48c3BhbiBjbGFzcz0iZnJhY3Rpb24gbm9uLWxlYWYiIG1hdGhxdWlsbC1jb21tYW5kLWlkPSIyMiI+PHNwYW4gY2xhc3M9Im51bWVyYXRvciIgbWF0aHF1aWxsLWJsb2NrLWlkPSIyMyI+PHNwYW4gbWF0aHF1aWxsLWNvbW1hbmQtaWQ9IjI2Ij44PC9zcGFuPjxzcGFuIG1hdGhxdWlsbC1jb21tYW5kLWlkPSIyNyI+MDwvc3Bhbj48L3NwYW4+PHNwYW4gY2xhc3M9ImRlbm9taW5hdG9yIiBtYXRocXVpbGwtYmxvY2staWQ9IjI0Ij48c3BhbiBtYXRocXVpbGwtY29tbWFuZC1pZD0iMjgiPjM8L3NwYW4+PC9zcGFuPjxzcGFuIHN0eWxlPSJkaXNwbGF5OmlubGluZS1ibG9jazt3aWR0aDowIj4mbmJzcDs8L3NwYW4+PC9zcGFuPjxzcGFuIG1hdGhxdWlsbC1jb21tYW5kLWlkPSIzMyI+5oiWPC9zcGFuPjxzcGFuIG1hdGhxdWlsbC1jb21tYW5kLWlkPSIzNCI+Mjwvc3Bhbj48c3BhbiBtYXRocXVpbGwtY29tbWFuZC1pZD0iMzUiPjA8L3NwYW4+PHNwYW4gY2xhc3M9ImJpbmFyeS1vcGVyYXRvciIgbWF0aHF1aWxsLWNvbW1hbmQtaWQ9IjM2Ij4rPC9zcGFuPjxzcGFuIG1hdGhxdWlsbC1jb21tYW5kLWlkPSI0MSI+NDwvc3Bhbj48c3BhbiBjbGFzcz0ibm9uLWxlYWYiIG1hdGhxdWlsbC1jb21tYW5kLWlkPSIzNyI+PHNwYW4gc3R5bGU9InRyYW5zZm9ybTogc2NhbGUoMSwgMC45KTsiIGNsYXNzPSJzY2FsZWQgc3FydC1wcmVmaXgiPuKImjwvc3Bhbj48c3BhbiBjbGFzcz0ibm9uLWxlYWYgc3FydC1zdGVtIiBtYXRocXVpbGwtYmxvY2staWQ9IjM4Ij48c3BhbiBtYXRocXVpbGwtY29tbWFuZC1pZD0iNDAiPjU8L3NwYW4+PC9zcGFuPjwvc3Bhbj48L3NwYW4+PHNwYW4+IDwvc3Bhbj7vvIht77yJPGJyPjwvZGl2PjxkaXY+PGltZyBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzAwLzcwL3JCQUNGRk1NV3QzekcwZEhBQUE0bVhaNHIxMDMxMi5wbmciIGRhdGEtY2tlLXNhdmVkLXNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvMDAvNzAvckJBQ0ZGTU1XdDN6RzBkSEFBQTRtWFo0cjEwMzEyLnBuZyIgaGVpZ2h0PSIxMzgiIHdpZHRoPSIyODAiPjwvZGl2PjxkaXY+PGJyPjwvZGl2Pg==
本课配套习题挑战模式5/5
单选题
难度系数：
5.
四边形
中，
，则四边形的面积为（ ）
| A:
|
| B:
|
| C:
|
| D:
|
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+6L+e5o6lQUPvvIzmsYLlh7pBQzwvcD4=
- 提示2：PHA+5L2cQ0jiiqVBRO+8jOWIqeeUqOaWueeoi+aAneaDs+axguWHukNIPC9wPg==
- 答案：RA==
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
