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.下列四组线段中，能组成直角三角形的是（ ）
| A: a=1，b=2，c=3 |
| B: a=2，b=3，c=4 |
| C: a=2，b=4，c=5 |
| D: a=3，b=4，c=5 |
一次做对，真牛！
+5奖励规则>
- 提示1：5qC55o2u5Yu+6IKh5a6a55CG55qE6YCG5a6a55CG5a+55ZCE6YCJ6aG56L+b6KGM6YCQ5LiA5YiG5p6Q5Y2z5Y+v77yO
- 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.由下列条件不能判定△ABC为直角三角形的是（ ）
| A: ∠A+∠B=∠C |
| B: ∠A：∠B：∠C=1：3：2 |
| C: （b+c）（b﹣c）=a2 |
| D: a=3+k，b=4+k，c=5+k（k＞0） |
一次做对，真牛！
+5奖励规则>
- 提示1：55Sx5Yu+6IKh5a6a55CG55qE6YCG5a6a55CG77yM5Y+q6KaB6aqM6K+B5Lik5bCP6L6555qE5bmz5pa55ZKM562J5LqO5pyA6ZW/6L6555qE5bmz5pa55oiW5pyA5aSn6KeS5piv5ZCm5pivOTDCsOWNs+WPr+WIpOaWreKWs0FCQ+aYr+WQpuS4uuebtOinkuS4ieinkuW9ou+8jg==
- 答案：RA==
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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a、b、c为△ABC的三边，且满足（a﹣b）（a2+b2﹣c2）=0，则△ABC是（ ）
| A: 等边三角形 |
| B: 直角三角形 |
| C: 等腰直角三角形 |
| D: 等腰三角形或直角三角形 |
一次做对，真牛！
+5奖励规则>
- 提示1：55Sx77yIYe+5o2LvvInvvIhhPHN1cD4yPC9zdXA+K2I8c3VwPjI8L3N1cD7vuaNjPHN1cD4yPC9zdXA+77yJPTDvvIzlj6/lvpfvvJph77mjYj0w77yM5oiWYTxzdXA+Mjwvc3VwPitiPHN1cD4yPC9zdXA+77mjYzxzdXA+Mjwvc3VwPj0w77yM6L+b6ICM5Y+v5b6XYT1i5oiWYTxzdXA+Mjwvc3VwPitiPHN1cD4yPC9zdXA+PWM8c3VwPjI8L3N1cD7vvIzov5vogIzliKTmlq3ilrNBQkPnmoTlvaLnirbkuLrnrYnohbDkuInop5LlvaLmiJbnm7Top5LkuInop5LlvaLvvI4=
- 答案：RA==
6Kej77ya4oi177yIYe+5o2LvvInvvIhhPHN1cD4yPC9zdXA+K2I8c3VwPjI8L3N1cD7vuaNjPHN1cD4yPC9zdXA+77yJPTDvvIw8YnI+4oi0Ye+5o2I9MO+8jOaIlmE8c3VwPjI8L3N1cD4rYjxzdXA+Mjwvc3VwPu+5o2M8c3VwPjI8L3N1cD49MO+8jDxicj7ljbNhPWLmiJZhPHN1cD4yPC9zdXA+K2I8c3VwPjI8L3N1cD49YzxzdXA+Mjwvc3VwPu+8jDxicj7iiLTilrNBQkPnmoTlvaLnirbkuLrnrYnohbDkuInop5LlvaLmiJbnm7Top5LkuInop5LlvaLvvI48YnI+5pWF6YCJ77yaRO+8jg==
本课配套习题挑战模式4/5
单选题
难度系数：
4.如果△ABC的三边长分别为a、b、c，并且满足a2+b2+c2+338=10a+24b+26c，则△ABC的形状是（ ）．
| A: 等腰三角形 |
| B: 等边三角形 |
| C: 直角三角形 |
| D: 等腰直角三角形 |
一次做对，真牛！
+5奖励规则>
- 提示1：5qC55o2u5Yu+6IKh5a6a55CG55qE6YCG5a6a55CG77ya5aaC5p6c5LiJ6KeS5b2i5pyJ5Lik6L6555qE5bmz5pa55ZKM562J5LqO56ys5LiJ6L6555qE5bmz5pa577yM6YKj5LmI6L+Z5Liq5piv55u06KeS5LiJ6KeS5b2i5Yik5a6a5YiZ5Y+v77yO5aaC5p6c5pyJ6L+Z56eN5YWz57O777yM6L+Z5Liq5bCx5piv55u06KeS5LiJ6KeS5b2i77yO5oqKYTxzdXA+Mjwvc3VwPitiPHN1cD4yPC9zdXA+K2M8c3VwPjI8L3N1cD4rMzM4PTEwYSsyNGIrMjZj5YyW566A5ZCO5Yik5pat5YiZ5Y+v77yO
- 答案：Qw==
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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AD⊥CD，AB=13，BC=12，CD=4，AD=3，则四边形ABCD的面积是( )
| A: 36 |
| B: 32 |
| C: 28 |
| D: 24 |
一次做对，真牛！
+5奖励规则>
- 提示1：6L+e5o6lQUPvvIzmiorlm5vovrnlvaLliIbop6PmiJDkuKTkuKrnm7Top5LkuInop5LlvaLvvIzliIbliKvmsYLlh7rpnaLnp6/nm7jliqDljbPlj68=
- 答案：QQ==
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
