中学生网络课堂本课配套习题挑战模式1/3
单选题
难度系数：
1.
命题“若a＞b，则ac2＞bc2(a、b∈R)”与它的逆命题、否命题中，真命题的个数为（ ）
| A: 3 |
| B: 2 |
| C: 1 |
| D: 0 |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+5ZCm5ZG96aKY5piv5a+55Y6f5ZG96aKY55qE5p2h5Lu25LiO57uT6K666YO95ZCm5a6aPGJyPjwvcD4=
- 提示2：PHA+6YCG5ZG96aKY5LiO5ZCm5ZG96aKY5Li6562J5Lu35ZG96aKY77yM5Y2z55yf5YC855u45ZCMPGJyPjwvcD4=
- 答案：Qg==
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
本课配套习题挑战模式2/3
单选题
难度系数：
2.
有下列四个命题：①“若xy=1，则x，y互为倒数”的逆命题；②“面积相等的三角形全等”的否命题； ③“若b＜0，则x2 +ax+b=0有实根”的逆否命题； ④“若x＞2，则x＞3”的逆否命题．其中真命题是（ ）
| A: ①② |
| B: ②③ |
| C: ①②③ |
| D: ③④ |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+5ZCm5ZG96aKY5piv5a+55Y6f5ZG96aKY55qE5p2h5Lu25ZKM57uT6K666YO96L+b6KGM5ZCm5a6aPC9wPg==
- 提示2：PHA+6YCG5ZG96aKY5piv5oqK5Y6f5ZG96aKY55qE5p2h5Lu25ZKM57uT6K665a+56LCDPC9wPg==
- 提示3：PHA+5Y6f5ZG96aKY5LiO6YCG5ZCm5ZG96aKY5piv562J5Lu35ZG96aKYPC9wPg==
- 答案：Qw==
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
本课配套习题挑战模式3/3
单选题
难度系数：
3.
命题
不等式
的解集为
；命题
在
中“
”是“
”成立的必要充分条件，则下列命题为真命题的为（ ）
| A:
|
| B:
|
| C:
|
| D:
|
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+4oCc5LiU4oCd5ZG96aKY77yM5ZCM55yf5Li655yf77yM5LiA5YGH5Li65YGHPGJyPjxicj48L3A+
- 答案：Qw==
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
