çï¼
æè§å¾ä½ è¿è¿ç¨æ¯ä¸æ¯æç¹é®é¢äºï¼
å ¶å®ä¸é´åéåºè¯¥æ¯ÏåÏï¼ä¸æ¯xåy
å 为æååéææ¯xåyç
è¿ç¨æ¯è¾å¤æï¼å¦å¾æ示ï¼ç¨è®°å·ƒ₁åƒ₂表达æ¯è¾æ¹ä¾¿
å¾é«å
´è½åçæ¨çæé®ï¼æ¨ä¸ç¨æ·»å ä»»ä½è´¢å¯ï¼åªè¦åæ¶é纳就æ¯å¯¹æ们æ好çåæ¥
ãè¥æé®äººè¿æä»»ä½ä¸æçå°æ¹å¯éæ¶è¿½é®ï¼æä¼å°½é解çï¼ç¥æ¨å¦ä¸è¿æ¥ï¼è°¢è°¢ã