åæ¸ä¸çï¼æ以å¯è½çç»ææ (m+n)^2 ç§ã
1ï¼ä¸¤çåè²ï¼ç»ææ m^2+n^2 ç§ï¼å æ¤æ¦ç为 (m^2+n^2)/(m+n)^2 ï¼
2ï¼ä¸¤çå¼è²ï¼ç»ææ 2mn ç§ï¼å æ¤æ¦ç为 2mn/(m+n)^2 ã
ç± m^2+n^2>=2mn å¾
å½ m=n æ¶ï¼ä¸¤äºä»¶çæ¦çç¸çï¼å½ mâ n æ¶ï¼åè²çå¯è½æ§æ´å¤§ ã
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