第一题我也是这么个思路.
第二题：按位数算.百位可取除5之外1~9,即8种可能.十位1~9,9种可能.个位满足奇数且不含5的,有1,3,7,9,4种可能.所以共有8*9*4=282个数.
请尽量给出详述,本人数学不好.The diagonal of the floor of a rectangular cl
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