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，OC是∠AOB的平分线，OD是∠AOC的平分线，且∠BOC=50°，则∠COD=（ ）
| A: 50° |
| B: 25° |
| C: 100° |
| D: 75° |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+5Li76KaB6ICD5p+l5LqG6KeS5bmz5YiG57q/55qE5a6a5LmJLiDkuIDmnaHlsITnur/miorkuIDkuKrop5LliIbmiJDnm7jnrYnnmoTkuKTkuKrop5LvvIzov5nmnaHlsITnur/lj6vov5nkuKrop5LnmoTlubPliIbnur88L3A+
- 提示2：PHA+5L6L5aaC6aKY55uu5Lit55qET0TmmK/iiKBBT0PnmoTlubPliIbnur/vvIzliKnnlKjop5LlubPliIbnur/nmoTmgKfotKjmsYLlvpc8L3A+
- 提示3：PHA+4oigQU9EPeKIoENPRD08aW1nIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvMjUvMzYvckJBQ0UxTU5tQ21qOVYtSkFBQUJEbDlBcXBNMDQ1LnBuZyIgZGF0YS1ja2Utc2F2ZWQtc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC8yNS8zNi9yQkFDRTFNTm1DbWo5Vi1KQUFBQkRsOUFxcE0wNDUucG5nIiBoZWlnaHQ9IjQyIiB3aWR0aD0iOCI+4oigQU9DPC9wPg==
- 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.
如图所示，将一张长方形纸的一角斜折过去，使顶点A落在A′处，BC为折痕，如果BD为∠A′BE的平分线，则∠CBD=（ ）
| A: 80° |
| B: 90° |
| C: 100° |
| D: 70° |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+6L+Y5Y6f5Ye65Y6f5p2l55qE5q2j5pa55b2i57q454mH77yM5Y+v5b6XQkPlkoxCROaYr+KIoEHigLJCQeWSjOKIoEHigLJCReeahOinkuW5s+WIhue6vzwvcD4=
- 提示2：PHA+5Yip55So6KeS5bmz5YiG57q/55qE5oCn6LSo5ZKM5bmz6KeS55qE5a6a5LmJ6K6h566XPC9wPg==
- 答案：Qg==
PGRpdj7op6PvvJrlm6DkuLrlsIbpobbngrlB5oqY5Y+g6JC95ZyoQeKAsuWkhO+8jOaJgOS7peKIoEFCQz3iiKBB4oCyQkPvvIw8YnI+5Y+I5Zug5Li6QkTkuLriiKBB4oCyQkXnmoTlubPliIbnur/vvIw8YnI+5omA5Lul4oigQeKAskJEPeKIoERCRe+8jDxicj7lm6DkuLriiKBBQkMr4oigQeKAskJDK+KIoEHigLJCRCviiKBEQkU9MTgwwrDvvIw8YnI+4oi0MuKIoEHigLJCQysy4oigQeKAskJEPTE4MMKw77yMPGJyPuaJgOS7peKIoENCRD3iiKBB4oCyQkMr4oCyQeKAskJEPTkwwrAuPGJyPuaVhemAiUIuPC9kaXY+
本课配套习题挑战模式3/5
单选题
难度系数：
3.
如图，OB是∠AOC的角平分线，OD是∠COE的角平分线，∠AOE=140°，∠COD=30°，则∠AOB=（ ）
| A: 35° |
| B: 40° |
| C: 45° |
| D: 50° |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+55Sx6K++5Lit5omA6K6y55qE55+l6K+G55qE55u05o6l6L+Q55So57uT6K6677yM5Y2z77ya4oigRE9CPTxpbWcgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC8yNS8zNi9yQkFDRTFNTm1DbWo5Vi1KQUFBQkRsOUFxcE0wNDUucG5nIiBkYXRhLWNrZS1zYXZlZC1zcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzI1LzM2L3JCQUNFMU1ObUNtajlWLUpBQUFCRGw5QXFwTTA0NS5wbmciIGhlaWdodD0iNDIiIHdpZHRoPSI4Ij7iiKBBT0U8L3A+
- 提示2：PHA+5rGC5Ye64oigRE9C55qE5bqm5pWw77yM5YaN57uT5ZCI5bey55+l5p2h5Lu25ZKM5Zu+5b2i5Y2z5Y+v5rGC5Ye64oigQU9C55qE5bqm5pWwPC9wPg==
- 答案：Qg==
PGRpdj7op6PvvJriiLVPQuaYr+KIoEFPQ+eahOW5s+WIhue6v++8jE9E5piv4oigQ09F55qE5bmz5YiG57q/77yMPGJyPuKItOKIoERPQj3iiKBDT0Ir4oigRE9DPTxpbWcgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC8yNS8zNi9yQkFDRTFNTm1DbWo5Vi1KQUFBQkRsOUFxcE0wNDUucG5nIiBkYXRhLWNrZS1zYXZlZC1zcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzI1LzM2L3JCQUNFMU1ObUNtajlWLUpBQUFCRGw5QXFwTTA0NS5wbmciIGhlaWdodD0iNDIiIHdpZHRoPSI4Ij7iiKBBT0U9PGltZyBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzI1LzM2L3JCQUNFMU1ObUNtajlWLUpBQUFCRGw5QXFwTTA0NS5wbmciIGRhdGEtY2tlLXNhdmVkLXNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvMjUvMzYvckJBQ0UxTU5tQ21qOVYtSkFBQUJEbDlBcXBNMDQ1LnBuZyIgaGVpZ2h0PSI0MiIgd2lkdGg9IjgiPsOXMTQwwrA9NzDCsO+8mzxicj7lj4jiiLXiiKBDT0Q9MzDCsO+8jDxicj7iiLTiiKBBT0I94oigQk9DPTQwwrAuPGJyPuaVhemAiUIuPC9kaXY+
本课配套习题挑战模式4/5
单选题
难度系数：
4.在如图所示的2×2正方格中，连接AB，AC，AD，则∠1+∠2+∠3的和（ ）
| A: 必是直角 |
| B: 必是锐角 |
| C: 必是钝角 |
| D: 是钝角或锐角 |
一次做对，真牛！
+5奖励规则>
- 提示1：IOinguWvn+WbvuW9ouWPr+efpeivpeWbvuW9ouWFs+S6jue6v+autUFD5omA5Zyo55qE55u057q/5a+556ewLOWPr+agueaNruWvueensOaAp+aJvuWIsOWHoOe7hOWvueW6lOinkuW6puebuOetiQ==
- 提示2：IOS7juiAjOW+l+WIsOKIoDEr4oigMz05MMKw
- 提示3：IOKIoDI9NDXCsO+8jOS7juiAjOaxguW+l+S4ieS4quinkueahOWSjA==
- 答案：Qw==
PGRpdj7op6PvvJriiLUyw5cy5q2j5pa55qC85YWz5LqO57q/5q61QUPmiYDlnKjnmoTnm7Tnur/lr7nnp7DvvIw8YnI+4oi04oigMSviiKAzPTkwwrDvvIziiKAyPTQ1wrDvvIw8YnI+4oi04oigMSviiKAyK+KIoDM9OTDCsCs0NcKwPTEzNcKwLiA8YnI+5pWF6YCJQy4gPC9kaXY+
本课配套习题挑战模式5/5
单选题
难度系数：
5.
如图，OM、OP、ON分别是∠AOB、∠AOC和∠BOC的平分线，则下列各式能成立的是（ ）
| A: ∠AOP＞∠MON |
| B: ∠AOP=∠MON |
| C: ∠AOP＜∠MON |
| D: ∠AOP=∠BOC |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+6KeS5bmz5YiG57q/5a6a5LmJ55qE5bqU55So77yM6KeC5a+f5Zub5Liq6YCJ6aG55Y+v55+l5Li76KaB5q+U6L6D4oigQU9Q5ZKM4oigTU9O55qE5aSn5bCP77yM5o6l5LiL5p2l5bCx5piv566X5Ye64oigQU9Q5ZKM4oigTU9OPC9wPg==
- 提示2：PHA+5qC55o2u6KeS5bmz5YiG57q/5a6a5LmJ5b6X5Ye64oigQU9QPTxpbWcgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC8yNS8zNi9yQkFDRTFNTm1DbWo5Vi1KQUFBQkRsOUFxcE0wNDUucG5nIiBkYXRhLWNrZS1zYXZlZC1zcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzI1LzM2L3JCQUNFMU1ObUNtajlWLUpBQUFCRGw5QXFwTTA0NS5wbmciIGhlaWdodD0iNDIiIHdpZHRoPSI4Ij7iiKBBT0M8L3A+
- 提示3：PHA+5Y+I5Zug5Li6T03jgIFPTuWIhuWIq+aYr+KIoEFPQuWSjOKIoEJPQ+eahOW5s+WIhue6v++8jOWPr+ebtOaOpeWIqeeUqOivvuS4reaJgOW+l+WHuueahOe7k+iuuu+8m+W+l+WHuuKIoE1PTj08aW1nIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvMjUvMzYvckJBQ0UxTU5tQ21qOVYtSkFBQUJEbDlBcXBNMDQ1LnBuZyIgZGF0YS1ja2Utc2F2ZWQtc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC8yNS8zNi9yQkFDRTFNTm1DbWo5Vi1KQUFBQkRsOUFxcE0wNDUucG5nIiBoZWlnaHQ9IjQyIiB3aWR0aD0iOCI+4oigQU9DPC9wPg==
- 答案：Qg==
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
