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等比数列求和公式逆用例说湖北襄阳一中李继武等比数列求和公式表明是一个关于ｑ的整式．逆用该公式，可解答有关的整除性问题．例１求证：若ｎ是正奇数，１＋ｘ＂能被１＋Ｘ整除，但不能被１－Ｘ整除．是奇＿证明＂：是奇由公式（１）知是整式被１＋Ｘ整除．右端前者是整...
The inverse use case of the geometric sum formula of the equal number sequence says that the sum formula of Li Jiwu’s equivalence series in Hubei Yiyang Yizhong shows that it is an integer about q. By using this formula in reverse, the divisibility problem can be solved. Example 1 Verification: If n is a positive odd number, 1+x“ can be divisible by 1+X, but it cannot be divisible by 1-X. It is odd that _ proves ”: is odd. From formula (1) it is known that the whole formula is divisible by 1+X. The right end is the whole...