å¦æé¢ç®æ²¡ææéï¼é£ä¸å®æ¯é¢ç®è®¾ç½®æé®é¢ãå 为æ±å¯¼åæ¾ç¶åå½æ°çåè°ååºé´æ¯å¦åå¨è·bå¼æ²¡æä»»ä½å
³ç³»ï¼èä¸ä¸å®åå¨ååºé´ã
å¦ææé¢è®¾çf(x)åæf'(x)ï¼å³å
¶å¯¼æ°ç表达å¼ï¼è¿ä¸ªé¢å°±å¯ä»¥åäºã
解ï¼è¥f(x)åå¨åè°éååºé´ï¼åf'(x)åå¨è´å¼åºé´ï¼åx为æ£æ°ï¼ååªéå¤æåå表达å¼ä¸ºè´å¼æ¶bçåå¼ã
f'(x)çååå¯æ´ç为 x^2 + 2*x*[(1-b)/2] + [(1-b)/2]^2 +1 - [(1-b)/2]^2
= {x + [(1-b)/2]}^2 + (3-b)(b-1)/4
å 为æ¤å¼åå¨è´å¼åºé´ï¼å{x + [(1-b)/2]}^2 ⥠0ï¼å(3-b)(b-1)/4åå¨è´å¼åºé´ã
å¾bçåå¼èå´ä¸º (è´æ ç©·ï¼1)U(1, 3)
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