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.用0,1,2,3,组成没有重复数字的四位数其中偶数有__________个。
| A: 8 |
| B: 10 |
| C: 5 |
| D: 6 |
一次做对，真牛！
+5奖励规则>
- 提示1：IOi/memHjDDmmK/nibnmrornmoTlhYPntKDvvIww5LiN6IO95Zyo5Y2D5L2N44CC5b2T5pyr5bC+5pWw5a2X5pivMOeahOaXtuWAme+8jOWJqeS9meeahDPkuKrlhYPntKDlhajmjpLliJfvvIzmraTml7bmnIk8aW1nIHdpZHRoPTQxIGhlaWdodD0yMSBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzRDL0ZFL3JCQUNFMU4xN18zU1lUTkNBQUFCcXJBZ0V6NDgwNy5wbmciPuS4quWBtuaVsA==
- 提示2：IOWmguaenDLlnKjmnKvlsL7mlbDvvIzpgqPkuYgw5pyJMuenjemAieaLqe+8jOWJqeS9meeahOS4pOS4quaVsOaciTLnp43pgInmi6nvvIzov5nnp43mg4XlhrXkuIvvvIzmnIk05Liq5YG25pWw44CC5YWx5pyJNis0PTEw5Liq5YG25pWw
- 答案：Qg==
6Kej77ya6L+Z6YeMMOaYr+eJueauiueahOWFg+e0oO+8jDDkuI3og73lnKjljYPkvY3jgILlvZPmnKvlsL7mlbDlrZfmmK8w55qE5pe25YCZ77yM5Ymp5L2Z55qEM+S4quWFg+e0oOWFqOaOkuWIl++8jOatpOaXtuaciTxpbWcgd2lkdGg9NDEgaGVpZ2h0PTIxIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvNEMvRkUvckJBQ0UxTjE3XzNTWVROQ0FBQUJxckFnRXo0ODA3LnBuZyI+5Liq5YG25pWw77yM5aaC5p6cMuWcqOacq+WwvuaVsO+8jOmCo+S5iDDmnIky56eN6YCJ5oup77yM5Ymp5L2Z55qE5Lik5Liq5pWw5pyJMuenjemAieaLqe+8jOi/meenjeaDheWGteS4i++8jOaciTTkuKrlgbbmlbDjgILlhbHmnIk2KzQ9MTDkuKrlgbbmlbDjgII=
本课配套习题挑战模式2/3
单选题
难度系数：
2.7种不同的花种在排成一排的7个花盆里，有两种葵花不种在中间也不种在两端，有______种不同的种法。
| A: 1440 |
| B: 1223 |
| C: 920 |
| D: 261 |
一次做对，真牛！
+5奖励规则>
- 提示1：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
- 提示2：IOWFseaciTxpbWcgd2lkdGg9MzAgaGVpZ2h0PTIxIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvMTAvRjQvckJBQ0ZGTjE4Ql9nZXJXZkFBQUJ6UmxKa0J3NDM0LnBuZyI+PTE0NDDnp43kuI3lkIznmoTnp43ms5XjgII=
- 答案：QQ==
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
本课配套习题挑战模式3/3
单选题
难度系数：
3.用0,1,2,3,4,这5个数组成没有重复数字的三位数，其中偶数有___________个。
| A: 20 |
| B: 30 |
| C: 40 |
| D: 50 |
一次做对，真牛！
+5奖励规则>
- 提示1：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
- 提示2：IOWFseaciTEyKzE4PTMw5Liq5YG25pWw
- 答案：Qg==
6Kej77ya6L+Z6YeMMOS4jeiDveaOkuWcqOmmluS9je+8jOWug+aYr+eJueauiuWFg+e0oO+8jOS8mOWFiOWuieaOkjDjgILov5nkuKrpl67popjliIbmiJDkuKTnsbvvvIww5Zyo5pyr5bC+77yMMOS4jeWcqOacq+WwvuOAgjDlnKjmnKvlsL7nmoTml7blgJnvvIzmnIk8aW1nIHdpZHRoPTE1IGhlaWdodD0yMSBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzRDL0ZGL3JCQUNFMU4xOEJfU2RwZnBBQUFCaS1hTXl2azY5OC5wbmciPj0xMuS4quWBtuaVsOOAgjDkuI3lnKjmnKvlsL7nmoTml7blgJnvvIzmnKvlsL7mlbDmnInkuKTnp43pgInmi6nvvIznmb7kvY3mlbDmnIkz56eN6YCJ5oup77yM5Y2B5L2N5pWw5pyJM+enjemAieaLqe+8jOatpOaXtuaciTxpbWcgd2lkdGg9ODkgaGVpZ2h0PTIxIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvNEMvRkYvckJBQ0UxTjE4Q3FoYnE3REFBQUI1cnA0ckY0NDMwLnBuZyI+5Liq5YG25pWw44CC5YWx5pyJMTIrMTg9MzDkuKrlgbbmlbDjgII=
