1/5单选题
难度：
1.以下各组数为边的三角形中，不是直角三角形的是（ ）
| A | 3，4，5 |
| B | 6，8，10 |
| C | 7，24，25 |
| D | 3.5，4.5，5.5 |
- 提示1：
- IOagueaNruWLvuiCoeWumueQhueahOmAhuWumueQhuWvueWbm+S4qumAiemhuei/m+ihjOmAkOS4gOWIpOaWreWNs+WPrw==
正确答案：RA==
PGRpdj7op6PvvJo8aW1nIHdpZHRoPTEwOSBoZWlnaHQ9MjEgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC8wMC82MS9yQkFDRkZNTVZnZnlld2RnQUFBQ0duLTFEZWs2NzYucG5nIj7kuI3nrKblkIjli77ogqHlrprnkIbnmoTpgIblrprnkIY8L2Rpdj4=
2/5单选题
难度：
2.观察下列勾股数：3，4，5；5，12，13；7，24，25；9，40，41；…，a，b，c，根据你发现的规律，请写出当a=19时，b、c的值为（ ）
| A | 180，181 |
| B | 160，161 |
| C | 60，61 |
| D | 80，81 |
- 提示1：
- IOinguWvn+W+l+e7meWHuueahOWLvuiCoeaVsOS4re+8jOaWnOi+ueS4jui+g+Wkp+ebtOinkui+ueeahOW3ruaYrzHvvIzljbNjLWI9Me+8jOWPr+W7uueri+aWueeoi+iuoeeulw==
正确答案：QQ==
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
3/5单选题
难度：
3.观察下列勾股数：3，4，5；5，12，13；7，24，25；9，40，41；…，a，b，c，根据你发现的规律，判断15，111，112是否为一组勾股数（ ）
| A | 不是 |
| B | 是 |
- 提示1：
- IOWLvuiCoeaVsOeahOinhOW+iw==
正确答案：QQ==
PGRpdj7op6PvvJrlpoLmnpw8aW1nIHdpZHRoPTE0IGhlaWdodD0yMSBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzIzLzUxL3JCQUNFMU1NVmlDal9zU2ZBQUFCTGxpSV9YUTk2Ni5wbmciPuaYr+Wlh+aVsO+8jOS4lDxpbWcgd2lkdGg9NDggaGVpZ2h0PTIxIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvMDAvNjIvckJBQ0ZGTU1WaUh6RU9XWEFBQUJpSGszWWVZMzU4LnBuZyI+PC9kaXY+PGRpdj7pgqPkuYggPGltZyB3aWR0aD05MiBoZWlnaHQ9NDIgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC8wMC82Mi9yQkFDRkZNTVZpR1F2ZWU4QUFBQ1NINFd2R0U3OTIucG5nIj7lj6/mnoTmiJDkuIDnu4Tli77ogqHmlbAgPC9kaXY+PGRpdj7ogIwgPGltZyB3aWR0aD0xNTkgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvMjMvNTEvckJBQ0UxTU1WaUhoSnQyQ0FBQUNwa3BxM0NrMjUzLnBuZyI+5omA5LulMTXvvIwxMTLvvIwxMTPmiY3mmK/kuIDnu4Tli77ogqHmlbA8L2Rpdj4=
4/5单选题
难度：
4.若正整数a，b，c是一组勾股数，则下列各组数一定还是勾股数的是（ ）
| A |  |
| B |  |
| C |  |
| D |  |
- 提示1：
- IOS4gOe7hOaVsOiLpeaYr+WLvuiCoeaVsO+8jOaJqeWkp+ebuOWQjOeahOWAjeaVsOWQjuS7jeeEtuaYr+WLvuiCoeaVsA==
正确答案：Qw==
PGRpdj7op6PvvJrkuIDnu4TmlbDoi6XmmK/li77ogqHmlbDvvIzmianlpKdr5YCN77yIa+KJoDDvvInlkI7ku43nhLbmmK/li77ogqHmlbDvvIzmiYDku6XpgInmi6lDPC9kaXY+
5/5单选题
难度：
5.观察下列勾股数：3，4，5；5，12，13；7，24，25；9，40，41；…，a，b，c，根据你发现的规律，请写出当a=2n+1时，b、c的值为（ ）
| A |  |
| B |  |
| C |  |
| D |  |
- 提示1：
- IOinguWvn+W+l+e7meWHuueahOWLvuiCoeaVsOS4re+8jOaWnOi+ueS4jui+g+Wkp+ebtOinkui+ueeahOW3ruaYrzHvvIzljbNjLWI9Me+8jOWPr+W7uueri+aWueeoi+iuoeeulw==
正确答案：QQ==
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