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Re:能解释一下吗？In Reply To:能解释一下吗？ Posted by:20083331 at 2009-07-21 16:36:05 先有公式：f(x)=f(x-2)*3+f(x-4)*2+f(x-6)*2+...+f(0)*2;
则： f(x-2)*3=f(x-2)*4-f(x-2)=
f(x-2)*4 -( f(x-4)*3+f(x-6)*2+...+f(0)*2） ）
故有： f(x)=f(x-2)*4-f(x-4);
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