Deng Sir's Blog
Only for mathematics education
Wednesday, July 23, 2014
卷8-8題
這題目應該還有更簡單的解法,但暫時沒想到
用到分數裂項法,但需要看到平方差可以化成兩個數相乘的結構:
即是:a^2-1=(a-1)(a+1)
過程有些複雜,需要細看。
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