1. (x-1)^n 二项式展开,并令x=1, 即证
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• 非常棒!最简洁的证明方法! -大酱风度- ♂ (93 bytes) () 07/24/2024 postreply 19:32:11
• 非常棒!最简洁的证明方法! -大酱风度- ♂ (93 bytes) () 07/24/2024 postreply 19:32:11
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