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.
青果学院组织了一次游戏：每位选手朝特制的靶子上各投三次飞镖，在同一圆环内得分相同. 如图所示，小明、小君、小红的成绩分别是29分、43分和33分，则小华的成绩是（ ）
| A: 31分 |
| B: 33分 |
| C: 36分 |
| D: 38分 |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+5YWI6K6+6aOe6ZWW5oqV5Yiw5pyA5bCP55qE5ZyG5Lit5b6XeOWIhu+8jOaKleWIsOS4remXtOeahOWchuS4reW+l3nliIbvvIzmipXliLDmnIDlpJbpnaLnmoTlnIbkuK3lvpd65YiG77yMPC9wPg==
- 提示2：PHA+5YaN5qC55o2u5bCP5piO44CB5bCP5ZCb44CB5bCP57qi55qE5oiQ57up5YiG5Yir5pivMjnliIbjgIE0M+WIhuWSjDMz5YiG77yM5YiX5Ye65pa556iL57uE77yM5rGC5Ye6eO+8jHnvvIx655qE5YC8PC9wPg==
- 提示3：PHA+5YaN5qC55o2u5bCP5Y2O5omA5oqV55qE6aOe6ZWW77yM5YiX5Ye65byP5a2Q77yM5rGC5Ye657uT5p6c5Y2z5Y+vLjwvcD4=
- 答案：Qw==
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
本课配套习题挑战模式2/5
单选题
难度系数：
2.
有铅笔、练习本、圆珠笔三种学习用品，若购铅笔3支，练习本7本，圆珠笔1支共需3.15元；若购铅笔4支，练习本8本，圆珠笔2支共需4.2元，那么，购铅笔、练习本、圆珠笔各1件共需（ ）
| A: 1.2元 |
| B: 1.05元 |
| C: 0.95元 |
| D: 0.9元 |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+6K6+6LSt5LiA5pSv6ZOF56yU77yM5LiA5pys57uD5Lmg5pys77yM5LiA5pSv5ZyG54+g56yU5YiG5Yir6ZyA6KaBeO+8jHnvvIx65YWD77yM5bu656uL5LiJ5YWD5LiA5qyh5pa556iL57uE77yM5Lik5Liq5pa556iL55u45YeP77yM5Y2z5Y+v5rGC5b6XeCt5K3rnmoTlgLwuPC9wPg==
- 答案：Qg==
PGRpdj7op6PnrZTvvJrorr7otK3kuIDmlK/pk4XnrJTvvIzkuIDmnKznu4PkuaDmnKzvvIzkuIDmlK/lnIbnj6DnrJTliIbliKvpnIDopoF477yMee+8jHrlhYPvvIw8YnI+5qC55o2u6aKY5oSP5b6XPGltZyBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzAwLzZDL3JCQUNGRk1NV2N1aDhnanRBQUFFZW41V1JUbzQ0My5wbmciIGRhdGEtY2tlLXNhdmVkLXNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvMDAvNkMvckJBQ0ZGTU1XY3VoOGdqdEFBQUVlbjVXUlRvNDQzLnBuZyIgd2lkdGg9IjEzNSIgaGVpZ2h0PSI2MiI+PC9kaXY+PGRpdj7ikaEt4pGg5b6XeCt5K3o9MS4wNe+8iOWFg++8iS48YnI+5pWF6YCJQi48L2Rpdj4=
本课配套习题挑战模式3/5
单选题
难度系数：
3.
为了奖励进步较大的学生，某班决定购买甲、乙、丙三种钢笔作为奖品，其单价分别为4元、5元、6元，购买这些钢笔需要花60元；经过协商，每种钢笔单价下降1元，结果只花了48元，那么甲种钢笔可能购买（ ）
| A: 11支 |
| B: 9支 |
| C: 7支 |
| D: 4支 |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+6K6+55Sy56eN6ZKi56yU5pyJeOaUr+OAgeS5meenjemSoueslOaciXnmlK/jgIHkuJnkuInnp43pkqLnrJTmnIl65pSvPGJyPjwvcD4=
- 提示2：PHA+5qC55o2u6aKY5oSP5YiX5pa556iL57uEPGJyPjwvcD48cD48YnI+PC9wPg==
- 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.如图①，在第一个天平上，砝码A的质量等于砝码B加上砝码C的质量；如图②，在第二个天平上，砝码A加上砝码B的质量等于3个砝码C的质量，则砝码A与砝码C的质量之比为（ ）
| A: 1：2 |
| B: 2：1 |
| C: 1：3 |
| D: 3：2 |
一次做对，真牛！
+5奖励规则>
- 提示1：IOatpOmimOWPr+S7peWIhuWIq+iuvuegneeggUHjgIFC44CBQ+eahOi0qOmHj+aYr3jvvIx577yMeg==
- 提示2：IOeEtuWQjuagueaNruS4pOS4quWkqeW5s+WIl+aWueeoi+e7hO+8jOa2iOWOu3nvvIzlvpfliLB45ZKMeuS5i+mXtOeahOWFs+ezu+WNs+WPry4=
- 答案：Qg==
PGRpdj7op6PvvJrorr7noJ3noIFB44CBQuOAgUPnmoTotKjph4/mmK9477yMee+8jHouIOagueaNrumimOaEj++8jOW+lzwvZGl2PjxkaXY+PGltZyB3aWR0aD04OCBoZWlnaHQ9NDIgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC8wMC82Qy9yQkFDRkZNTVdkWHhHV1JlQUFBQzdsZzdzYjAyNTYucG5nIj48L2Rpdj48ZGl2PuKRoCvikaHvvIzlvpc8YnI+Mng9NHrvvIw8YnI+eD0yei4gPGJyPuaVhemAiUIuIDwvZGl2Pg==
本课配套习题挑战模式5/5
单选题
难度系数：
5.
有一个牧场，牛在吃草，而草又在生长，已知饲养100头牛，草够吃25天，改为饲养84头牛，草可多吃10天，那么饲养94头牛，经过（ ）天，草便吃完.
| A: 33 |
| B: 32 |
| C: 30 |
| D: 28 |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+5qC55o2u5Y6f6I2J6YePK+avj+WkqeeUn+mVv+eahOiNiemHj8OX5pS+54mn55qE5aSp5pWwPeavj+WktOeJm+avj+WkqeWQg+iNiemHj8OX5aS05pWww5flpKnmlbDvvIzliJflh7rmlrnnqIvnu4Q8YnI+PC9wPg==
- 提示2：PHA+6K6+5q+P5aS054mb5q+P5aSp5ZCD6I2J6YeP5piveO+8jOiNieavj+WkqeWinumVv+mHj+aYr3nvvIw5NOWktOeJm3rlpKnlkIPlrozniafojYnvvIzlho3orr7niaflnLrljp/mnInojYnph4/mmK9hLuWPr+W+l+WIsOaWueeoi+e7hO+8mjxicj48L3A+PHA+PGltZyBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzAwLzZDL3JCQUNGRk1NV2RpdzM2YWlBQUFHUHd6VVlPSTY3OS5wbmciIGRhdGEtY2tlLXNhdmVkLXNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvMDAvNkMvckJBQ0ZGTU1XZGl3MzZhaUFBQUdQd3pVWU9JNjc5LnBuZyIgd2lkdGg9IjIyNyIgaGVpZ2h0PSI2MiI+PGJyPjwvcD4=
- 答案：RA==
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
