å边形ABMNå¨é¿ â(m^2+n^2) + â((m-2)^2+9) + â((n+1)^2+16) + â((4-2)^2+(-1+3)^2)
=â(m^2+n^2) + â(m^2-4m+13) + â(n^2+2n+17) + â8
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å 为f(m,n)=â(m^2+n^2) + â(m^2-4m+13) + â(n^2+2n+17) + â8å¨éåºé´[-10,10]Ã[-10,10] ä¸è¿ç»ï¼æ以å®å¿
ææå°å¼ãè f(2,-1)=â5+3+4+â8,æ以f(m,n)å¨éåºé´[-10,10]Ã[-10,10]ä¸çæå°å¼fmin <= â5+3+4+â8 ï¼èå¨[-10,10]Ã[-10,10]以å¤çææmï¼né½æ»¡è¶³f(m,n) > 10â2 > fminã
å³f(m,n) å¨éåºé´[-10,10]Ã[-10,10]å
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å 为f(m,n)çæå°å¼ç¹ä¸ä¸¤ä¸ªä¸é¶å导æ°ä¸º0ï¼ä»æ¤è¿å¯ä»¥å¤æåºmï¼nçåå¼èå´ä¸º
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