四张不同的卡片能够组成多少个不同的四位数？_哔哩哔哩_bilibili

Name: %E5%9B%9B%E5%BC%A0%E4%B8%8D%E5%90%8C%E7%9A%84%E5%8D%A1%E7%89%87%E8%83%BD%E5%A4%9F%E7%BB%84%E6%88%90%E5%A4%9A%E5%B0%91%E4%B8%AA%E4%B8%8D%E5%90%8C%E7%9A%84%E5%9B%9B%E4%BD%8D%E6%95%B0%EF%BC%9F
Uploaded: 2025-07-22T16:42:55.746Z
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