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.在△ABC中，∠A，∠B均为锐角，且sinA=
，cosB=
，AC=40，则△ABC的面积是（ ）
，cosB=，AC=40，则△ABC的面积是（ ） | A: 800 |
B: 800 |
| C: 400 |
| D: 400 |
一次做对，真牛！
+5奖励规则>
- 提示1：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
- 答案：RA==
6Kej77ya5aaC5Zu+5omA56S677yM6L+HQ+S9nENE4oqlQULvvIw8YnI+4oi15Zyo4pazQUJD5Lit77yM4oigQe+8jOKIoELlnYfkuLrplJDop5LvvIzkuJRzaW5BPTxpbWcgd2lkdGg9NyBoZWlnaHQ9NDIgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC84Mi8zRS9yQkFDSjFWMU9DdWdyY0hrQUFBQkpIdjlUYkE2MTIucG5nIj7vvIxjb3NCPTxpbWcgd2lkdGg9MTQgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvODIvMEUvckJBQ0psVjFPQ3VEQlJvUUFBQUJmYTJ5c28wODgyLnBuZyI+77yMPGJyPuKItOKIoEE94oigQj0zMMKw77yMPGJyPuKItEJDPUFD77yMPGJyPuKItETkuLpBQuS4reeCue+8jDxicj7lnKhSdOKWs0FDROS4re+8jEFDPTQw77yMPGJyPuKItENEPTxpbWcgd2lkdGg9NyBoZWlnaHQ9NDIgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC84Mi8zRS9yQkFDSjFWMU9DdWdyY0hrQUFBQkpIdjlUYkE2MTIucG5nIj5BQz0yMO+8jDxicj7moLnmja7li77ogqHlrprnkIblvpfvvJpBRD0yMDxpbWcgd2lkdGg9MTkgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvQjcvQzEvckJBQ0UxVjFPQ3VnZEJxekFBQUJidDV6UDc4NjM5LnBuZyI+77yMPGJyPuKItEFCPTJBRD00MDxpbWcgd2lkdGg9MTkgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvQjcvQzEvckJBQ0UxVjFPQ3VnZEJxekFBQUJidDV6UDc4NjM5LnBuZyI+77yMPGJyPuWImeKWs0FCQ+eahOmdouenr+aYrzxpbWcgd2lkdGg9NyBoZWlnaHQ9NDIgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC84Mi8zRS9yQkFDSjFWMU9DdWdyY0hrQUFBQkpIdjlUYkE2MTIucG5nIj5BQiYjODIyNjtDRD00MDA8aW1nIHdpZHRoPTE5IGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwL0I3L0MxL3JCQUNFMVYxT0N1Z2RCcXpBQUFCYnQ1elA3ODYzOS5wbmciPu+8jDxicj7mlYXpgIlE
本课配套习题挑战模式2/5
单选题
难度系数：
2.在直角三角形ABC中，已知∠C=90°，∠A=40°，BC=3，则AC=（ ）
| A: 3sin40° |
| B: 3sin50° |
| C: 3tan40° |
| D: 3tan50° |
一次做对，真牛！
+5奖励规则>
- 提示1：5Yip55So55u06KeS5LiJ6KeS5b2i5Lik6ZSQ6KeS5LqS5L2Z5rGC5b6X4oigQueahOW6puaVsO+8jOeEtuWQjuagueaNruato+WIh+WHveaVsOeahOWumuS5ieWNs+WPr+axguino++8jg==
- 答案：RA==
6Kej77ya4oigQj05MMKwLeKIoEE9OTDCsC00MMKwPTUwwrDvvIw8YnI+5Y+I4oi1dGFuQj08aW1nIHdpZHRoPTE1IGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzgyLzNFL3JCQUNKMVYxT0MzaUJWRnVBQUFCZ0p3SENuYzc4MS5wbmciPu+8jDxicj7iiLRBQz1CQyYjODIyNjt0YW5CPTN0YW41MMKw77yOPGJyPuaVhemAie+8mkTvvI4=
本课配套习题挑战模式3/5
单选题
难度系数：
3.
如果三角形满足一个角是另一个角的3倍，那么我们称这个三角形为“智慧三角形”．下列各组数据中，能作为一个智慧三角形三边长的一组是（ ）
| A: 1，2，3 |
| B: 1，1， |
| C: 1，1， |
| D: 1，2， |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+QeOAgeagueaNruS4ieinkuW9ouS4iei+ueWFs+ezu+WPr+efpe+8jOS4jeiDveaehOaIkOS4ieinkuW9ou+8jOS+neatpOWNs+WPr+S9nOWHuuWIpOWumu+8mzwvcD4=
- 提示2：PHA+QuOAgeagueaNruWLvuiCoeWumueQhueahOmAhuWumueQhuWPr+efpeaYr+etieiFsOebtOinkuS4ieinkuW9ou+8jOS+neatpOWNs+WPr+S9nOWHuuWIpOWumu+8mzwvcD4=
- 提示3：PHA+Q+OAgeino+ebtOinkuS4ieinkuW9ouWPr+efpeaYr+mhtuinkjEyMMKw77yM5bqV6KeSMzDCsOeahOetieiFsOS4ieinkuW9ou+8jOS+neatpOWNs+WPr+S9nOWHuuWIpOWumu+8mzwvcD4=
- 提示4：PHA+ROOAgeino+ebtOinkuS4ieinkuW9ouWPr+efpeaYr+S4ieS4quinkuWIhuWIq+aYrzkwwrDvvIw2MMKw77yMMzDCsOeahOebtOinkuS4ieinkuW9ou+8jOS+neatpOWNs+WPr+S9nOWHuuWIpOWumu+8jjwvcD4=
- 答案：RA==
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
本课配套习题挑战模式4/5
单选题
难度系数：
4.等腰三角形底边长为10cm，周长为36cm，那么底角的余弦等于（ ）
A:  |
B:  |
C:  |
D:  |
一次做对，真牛！
+5奖励规则>
- 提示1：6L+H6aG254K5QeS9nOW6lei+uUJD55qE5Z6C57q/QUTvvIzlnoLotrPmmK9E54K577yM5p6E6YCg55u06KeS5LiJ6KeS5b2i77yO5qC55o2u562J6IWw5LiJ6KeS5b2i55qE5oCn6LSo77yM6L+Q55So5LiJ6KeS5Ye95pWw55qE5a6a5LmJ77yM5YiZ5Y+v5Lul5rGC5b6X5bqV6KeS55qE5L2Z5bymY29zQueahOWAvO+8jg==
- 答案：QQ==
6Kej77ya5aaC5Zu+77yM5L2cQUTiiqVCQ+S6jkTngrnvvI48aW1nIHdpZHRoPTEzNyBoZWlnaHQ9MTI0IHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvQjcvQzEvckJBQ0UxVjFPRExCM3hDdEFBQUdvcnNEYmZnNTg0LnBuZyIgPjxicj7liJlDRD01Y23vvIw8YnI+QUI9QUM9MTNjbe+8jjxicj7iiLTlupXop5LnmoTkvZnlvKY9PGltZyB3aWR0aD0xMyBoZWlnaHQ9NDIgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC8xQy9ERC9yQkFDRkZWMU9ETGpULWsyQUFBQlVqVXNmY3c3NzkucG5nIj7vvI48YnI+5pWF6YCJQe+8jg==
本课配套习题挑战模式5/5
单选题
难度系数：
5.如图，在Rt△ABC中，∠ACB=90°，BC=3，AC=
，AB的垂直平分线ED交BC的延长线于D点，垂足为E，则sin∠CAD=（ ）
，AB的垂直平分线ED交BC的延长线于D点，垂足为E，则sin∠CAD=（ ） A:  |
B:  |
C:  |
D:  |
一次做对，真牛！
+5奖励规则>
- 提示1：6K6+QUQ9eO+8jOWImUNEPXgtM++8jOWcqOebtOinkuKWs0FDROS4re+8jOi/kOeUqOWLvuiCoeWumueQhuWPr+axguWHukFE44CBQ0TnmoTlgLzvvIzljbPlj6/op6PnrZTlh7rvvJs=
- 答案：QQ==
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
