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：
1.一个不透明的口袋里装有红、黑、绿三种颜色的乒乓球（除颜色外其余都相同），其中红球有2个，黑球有1个，绿球有3个，第一次任意摸出一个球（不放回），第二次再摸出一个球，则两次摸到的都是红球的概率为（ ）
A:  |
B:  |
C:  |
D:  |
一次做对，真牛！
+5奖励规则>
- 提示1：5YiX6KGo5b6X5Ye65omA5pyJ562J5Y+v6IO955qE5oOF5Ya15pWw77yM5om+5Ye65Lik5qyh6YO95piv57qi55CD55qE5oOF5Ya15pWw77yM5Y2z5Y+v5rGC5Ye65omA5rGC55qE5qaC546H77yO
- 答案：RA==
解：列表如下：<div align=center><table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0 style='margin-left:1.5pt;border-collapse:collapse'> <tr>  <td width=81 style='width:60.75pt;border:solid black 1.0pt;padding:3.75pt 3.75pt 3.75pt 3.75pt'>    </td>  <td width=81 style='width:60.75pt;border:solid black 1.0pt;border-left:none;  padding:3.75pt 3.75pt 3.75pt 3.75pt'>  红  </td>  <td width=81 style='width:60.75pt;border:solid black 1.0pt;border-left:none;  padding:3.75pt 3.75pt 3.75pt 3.75pt'>  红  </td>  <td width=81 style='width:60.75pt;border:solid black 1.0pt;border-left:none;  padding:3.75pt 3.75pt 3.75pt 3.75pt'>  黑  </td>  <td width=81 style='width:60.75pt;border:solid black 1.0pt;border-left:none;  padding:3.75pt 3.75pt 3.75pt 3.75pt'>  绿  </td>  <td width=81 style='width:60.75pt;border:solid black 1.0pt;border-left:none;  padding:3.75pt 3.75pt 3.75pt 3.75pt'>  绿  </td>  <td width=81 style='width:60.75pt;border:solid black 1.0pt;border-left:none;  padding:3.75pt 3.75pt 3.75pt 3.75pt'>  绿  </td> </tr> <tr>  <td style='border:solid black 1.0pt;border-top:none;padding:3.75pt 3.75pt 3.75pt 3.75pt'>  红  </td>  <td style='border-top:none;border-left:none;border-bottom:solid black 1.0pt;  border-right:solid black 1.0pt;padding:3.75pt 3.75pt 3.75pt 3.75pt'>  ---  </td>  <td style='border-top:none;border-left:none;border-bottom:solid black 1.0pt;  border-right:solid black 1.0pt;padding:3.75pt 3.75pt 3.75pt 3.75pt'>  （红，红）  </td>  <td style='border-top:none;border-left:none;border-bottom:solid black 1.0pt;  border-right:solid black 1.0pt;padding:3.75pt 3.75pt 3.75pt 3.75pt'>  （黑，红）  </td>  <td style='border-top:none;border-left:none;border-bottom:solid black 1.0pt;  border-right:solid black 1.0pt;padding:3.75pt 3.75pt 3.75pt 3.75pt'>  （绿，红）  </td>  <td style='border-top:none;border-left:none;border-bottom:solid black 1.0pt;  border-right:solid black 1.0pt;padding:3.75pt 3.75pt 3.75pt 3.75pt'>  （绿，红）  </td>  <td style='border-top:none;border-left:none;border-bottom:solid black 1.0pt;  border-right:solid black 1.0pt;padding:3.75pt 3.75pt 3.75pt 3.75pt'>  （绿，红）  </td> </tr> <tr>  <td style='border:solid black 1.0pt;border-top:none;padding:3.75pt 3.75pt 3.75pt 3.75pt'>  红  </td>  <td style='border-top:none;border-left:none;border-bottom:solid black 1.0pt;  border-right:solid black 1.0pt;padding:3.75pt 3.75pt 3.75pt 3.75pt'>  （红，红）  </td>  <td style='border-top:none;border-left:none;border-bottom:solid black 1.0pt;  border-right:solid black 1.0pt;padding:3.75pt 3.75pt 3.75pt 3.75pt'>  ---  </td>  <td style='border-top:none;border-left:none;border-bottom:solid black 1.0pt;  border-right:solid black 1.0pt;padding:3.75pt 3.75pt 3.75pt 3.75pt'>  （黑，红）  </td>  <td style='border-top:none;border-left:none;border-bottom:solid black 1.0pt;  border-right:solid black 1.0pt;padding:3.75pt 3.75pt 3.75pt 3.75pt'>  （绿，红）  </td>  <td style='border-top:none;border-left:none;border-bottom:solid black 1.0pt;  border-right:solid black 1.0pt;padding:3.75pt 3.75pt 3.75pt 3.75pt'>  （绿，红）  </td>  <td style='border-top:none;border-left:none;border-bottom:solid black 1.0pt;  border-right:solid black 1.0pt;padding:3.75pt 3.75pt 3.75pt 3.75pt'>  （绿，红）  </td> </tr> <tr>  <td style='border:solid black 1.0pt;border-top:none;padding:3.75pt 3.75pt 3.75pt 3.75pt'>  黑  </td>  <td style='border-top:none;border-left:none;border-bottom:solid black 1.0pt;  border-right:solid black 1.0pt;padding:3.75pt 3.75pt 3.75pt 3.75pt'>  （红，黑）  </td>  <td style='border-top:none;border-left:none;border-bottom:solid black 1.0pt;  border-right:solid black 1.0pt;padding:3.75pt 3.75pt 3.75pt 3.75pt'>  （红，黑）  </td>  <td style='border-top:none;border-left:none;border-bottom:solid black 1.0pt;  border-right:solid black 1.0pt;padding:3.75pt 3.75pt 3.75pt 3.75pt'>  ---  </td>  <td style='border-top:none;border-left:none;border-bottom:solid black 1.0pt;  border-right:solid black 1.0pt;padding:3.75pt 3.75pt 3.75pt 3.75pt'>  （绿，黑）  </td>  <td style='border-top:none;border-left:none;border-bottom:solid black 1.0pt;  border-right:solid black 1.0pt;padding:3.75pt 3.75pt 3.75pt 3.75pt'>  （绿，黑）  </td>  <td style='border-top:none;border-left:none;border-bottom:solid black 1.0pt;  border-right:solid black 1.0pt;padding:3.75pt 3.75pt 3.75pt 3.75pt'>  （绿，黑）  </td> </tr> <tr>  <td style='border:solid black 1.0pt;border-top:none;padding:3.75pt 3.75pt 3.75pt 3.75pt'>  绿  </td>  <td style='border-top:none;border-left:none;border-bottom:solid black 1.0pt;  border-right:solid black 1.0pt;padding:3.75pt 3.75pt 3.75pt 3.75pt'>  （红，绿）  </td>  <td style='border-top:none;border-left:none;border-bottom:solid black 1.0pt;  border-right:solid black 1.0pt;padding:3.75pt 3.75pt 3.75pt 3.75pt'>  （红，绿）  </td>  <td style='border-top:none;border-left:none;border-bottom:solid black 1.0pt;  border-right:solid black 1.0pt;padding:3.75pt 3.75pt 3.75pt 3.75pt'>  （黑，绿）  </td>  <td style='border-top:none;border-left:none;border-bottom:solid black 1.0pt;  border-right:solid black 1.0pt;padding:3.75pt 3.75pt 3.75pt 3.75pt'>  ---  </td>  <td style='border-top:none;border-left:none;border-bottom:solid black 1.0pt;  border-right:solid black 1.0pt;padding:3.75pt 3.75pt 3.75pt 3.75pt'>  （绿，绿）  </td>  <td style='border-top:none;border-left:none;border-bottom:solid black 1.0pt;  border-right:solid black 1.0pt;padding:3.75pt 3.75pt 3.75pt 3.75pt'>  （绿，绿）  </td> </tr> <tr>  <td style='border:solid black 1.0pt;border-top:none;padding:3.75pt 3.75pt 3.75pt 3.75pt'>  绿  </td>  <td style='border-top:none;border-left:none;border-bottom:solid black 1.0pt;  border-right:solid black 1.0pt;padding:3.75pt 3.75pt 3.75pt 3.75pt'>  （红，绿）  </td>  <td style='border-top:none;border-left:none;border-bottom:solid black 1.0pt;  border-right:solid black 1.0pt;padding:3.75pt 3.75pt 3.75pt 3.75pt'>  （红，绿）  </td>  <td style='border-top:none;border-left:none;border-bottom:solid black 1.0pt;  border-right:solid black 1.0pt;padding:3.75pt 3.75pt 3.75pt 3.75pt'>  （黑，绿）  </td>  <td style='border-top:none;border-left:none;border-bottom:solid black 1.0pt;  border-right:solid black 1.0pt;padding:3.75pt 3.75pt 3.75pt 3.75pt'>  （绿，绿）  </td>  <td style='border-top:none;border-left:none;border-bottom:solid black 1.0pt;  border-right:solid black 1.0pt;padding:3.75pt 3.75pt 3.75pt 3.75pt'>  ---  </td>  <td style='border-top:none;border-left:none;border-bottom:solid black 1.0pt;  border-right:solid black 1.0pt;padding:3.75pt 3.75pt 3.75pt 3.75pt'>  （绿，绿）  </td> </tr> <tr>  <td style='border:solid black 1.0pt;border-top:none;padding:3.75pt 3.75pt 3.75pt 3.75pt'>  绿  </td>  <td style='border-top:none;border-left:none;border-bottom:solid black 1.0pt;  border-right:solid black 1.0pt;padding:3.75pt 3.75pt 3.75pt 3.75pt'>  （红，绿）  </td>  <td style='border-top:none;border-left:none;border-bottom:solid black 1.0pt;  border-right:solid black 1.0pt;padding:3.75pt 3.75pt 3.75pt 3.75pt'>  （红，绿）  </td>  <td style='border-top:none;border-left:none;border-bottom:solid black 1.0pt;  border-right:solid black 1.0pt;padding:3.75pt 3.75pt 3.75pt 3.75pt'>  （黑，绿）  </td>  <td style='border-top:none;border-left:none;border-bottom:solid black 1.0pt;  border-right:solid black 1.0pt;padding:3.75pt 3.75pt 3.75pt 3.75pt'>  （绿，绿）  </td>  <td style='border-top:none;border-left:none;border-bottom:solid black 1.0pt;  border-right:solid black 1.0pt;padding:3.75pt 3.75pt 3.75pt 3.75pt'>  （绿，绿）  </td>  <td style='border-top:none;border-left:none;border-bottom:solid black 1.0pt;  border-right:solid black 1.0pt;padding:3.75pt 3.75pt 3.75pt 3.75pt'>  ---  </td> </tr></table><br>所有等可能的情况有30种，其中两次都是红球的情况有2种，<br>则P=<img width=13 height=42 src="https://p2.qingguo.com/G1/M00/82/22/rBACJ1V0-PWAdHJPAAABXCSxP-c113.png">=<img width=13 height=42 src="https://p2.qingguo.com/G1/M00/81/F3/rBACJlV0-PXRxWpeAAABMCC9fSI320.png">．<br>故选D．
本课配套习题挑战模式2/5
单选题
难度系数：
2.布袋中有红、黄、蓝三个球，它们除颜色不同以外，其他都相同，从袋中随机取出一个球后再放回袋中，这样取出球的顺序依次是“红-黄-蓝”的概率是（ ）
A:  |
| B: |
C:  |
D:  |
一次做对，真牛！
+5奖励规则>
- 提示1：5YiX5Li+5Ye65omA5pyJ5oOF5Ya177yM55yL55CD55qE6aG65bqP5L6d5qyh5piv4oCc57qiLem7hC3ok53igJ3nmoTmg4XlhrXmlbDljaDmiYDmnInmg4XlhrXmlbDnmoTlpJrlsJHljbPlj6/vvI4=
- 答案：QQ==
6Kej77yaPGltZyB3aWR0aD00ODcgaGVpZ2h0PTE2MCBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzFDL0FGL3JCQUNGRlYwLVBuU25hR25BQUFvM1JTcXZtMDkwLmpwZWciPjxicj7lhbHmnIkyN+enjeaDheWGte+8jOeQg+eahOmhuuW6j+S+neasoeaYr+KAnOe6oi3pu4Qt6JOd4oCd55qE5oOF5Ya15pWw5pyJMeenje+8jOaJgOS7peamgueOh+S4ujxpbWcgd2lkdGg9MTMgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvODEvRjMvckJBQ0psVjAtUG1RNlFhSUFBQUJTSTl6RThvMTE4LnBuZyI+77yOPGJyPuaVhemAiUHvvI4=
本课配套习题挑战模式3/5
单选题
难度系数：
3.一个立方体玩具的展开图如图所示．任意掷这个玩具，上表面与底面之和为偶数的概率为（ ）
A:  |
| B: |
C:  |
D:  |
一次做对，真牛！
+5奖励规则>
- 提示1：55Sx5pWw5a2X55Sx5pWw5a2XM+S4jjTnm7jlr7nvvIzmlbDlrZcx5LiONeebuOWvue+8jOaVsOWtlzLkuI4255u45a+577yM55u05o6l5Yip55So5qaC546H5YWs5byP5rGC6Kej5Y2z5Y+v5rGC5b6X562U5qGI77yOM+S4jjTnm7jlr7nvvIzmlbDlrZcx5LiONeebuOWvue+8jOaVsOWtlzLkuI4255u45a+577yM55u05o6l5Yip55So5qaC546H5YWs5byP5rGC6Kej5Y2z5Y+v5rGC5b6X562U5qGI77yO
- 答案：RA==
6Kej77ya4oi15pWw5a2XM+S4jjTnm7jlr7nvvIzmlbDlrZcx5LiONeebuOWvue+8jOaVsOWtlzLkuI4255u45a+577yMPGJyPuKItOS7u+aEj+aOt+i/meS4queOqeWFt++8jOS4iuihqOmdouS4juW6lemdouS5i+WSjOS4uuWBtuaVsOeahOamgueOh+S4uu+8mjxpbWcgd2lkdGg9NyBoZWlnaHQ9NDIgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC84Mi8yMi9yQkFDSjFWMC1QeVQ5UGJZQUFBQk81MW9VTkk0NjkucG5nIj7vvI48YnI+5pWF6YCJRO+8jg==
本课配套习题挑战模式4/5
单选题
难度系数：
4.有一个从袋子中摸球的游戏，小红根据游戏规则，作出了如下图所示的树形图，则此次摸球的游戏规则是（ ）
| A: 随机摸出一个球后放回，再随机摸出1个球 |
| B: 随机摸出一个球后不放回，再随机摸出1个球 |
| C: 随机摸出一个球后放回，再随机摸出3个球 |
| D: 随机摸出一个球后不放回，再随机摸出3个球 |
一次做对，真牛！
+5奖励规则>
- 提示1：5qC55o2u5qCR5b2i5Zu+77yM5Y+v5b6X5q2k5qyh5pG455CD55qE5ri45oiP6KeE5YiZ5piv77ya6ZqP5py65pG45Ye65LiA5Liq55CD5ZCO5pS+5Zue77yM5YaN6ZqP5py65pG45Ye6MeS4queQg++8jg==
- 答案：QQ==
6Kej77ya6KeC5a+f5qCR5b2i5Zu+5Y+v5b6X77ya6KKL5a2Q5Lit5YWx5pyJ57qi44CB6buE44CB6JOd5LiJ5Liq5bCP55CD77yMPGJyPuatpOasoeaRuOeQg+eahOa4uOaIj+inhOWImeS4uu+8mumaj+acuuaRuOWHuuS4gOS4queQg+WQjuaUvuWbnu+8jOWGjemaj+acuuaRuOWHujHkuKrnkIPvvI48YnI+5pWF6YCJQe+8jg==
本课配套习题挑战模式5/5
单选题
难度系数：
5.一个不透明的口袋里有4张形状完全相同的卡片，分别写有数字1，2，3，4，口袋外有两张卡片，分别写有数字2，3，现随机从口袋里取出一张卡片，则两次摸出的卡片的数字之和等于4的概率（ ）
A:  |
| B: |
C:  |
| D: 1 |
一次做对，真牛！
+5奖励规则>
- 提示1：5YiX6KGo5b6X5Ye65omA5pyJ562J5Y+v6IO955qE5oOF5Ya15pWw77yM5om+5Ye65Lik5qyh5pG45Ye655qE5Y2h54mH55qE5pWw5a2X5LmL5ZKM562J5LqONOeahOaDheWGte+8jOWNs+WPr+axguWHuuaJgOaxgueahOamgueOh++8jg==
- 答案：Qw==
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
