24690/12346^2-12345*13247)
问题描述：
24690/12346^2-12345*13247)
答
24690/(12346^2-12345*13247) =24690/(12346-(12346-1)(12346+1) =24690/1 =24690
24690/12346^2-12345*13247)
24690/(12346^2-12345*13247) =24690/(12346-(12346-1)(12346+1) =24690/1 =24690