10£®Éèf£¨x£©ÊǶ¨ÒåÔÚÇø¼ä$[\begin{array}{l}{2£¬8}\\{\;}\end{array}]$Éϵĺ¯Êý£¬Èç¹ûf£¨x£©ÔÚÇø¼ä$[\begin{array}{l}{2£¬6}\\{\;}\end{array}]$ÉϵÝÔö£¬ÔÚÇø¼ä$[\begin{array}{l}{6£¬8}\\{\;}\end{array}]$Éϵݼõ£¬ÔòÏÂÃæ¹ØÓÚº¯Êýf£¨x£©µÄÐðÊöÕýÈ·µÄÊÇ£¨¡¡¡¡£©
A£®f£¨2£©ÊǺ¯ÊýµÄ×îСֵB£®f£¨8£©ÊǺ¯ÊýµÄ×îСֵ
C£®f£¨6£©ÊǺ¯ÊýµÄ×î´óÖµD£®ÒÔÉϽáÂÛ¶¼²»¶Ô

·ÖÎö Óɺ¯ÊýµÄµ¥µ÷ÐÔ£¬¼´¿ÉµÃµ½f£¨6£©Îª×î´óÖµ£¬×îСֵΪf£¨2£©£¬f£¨8£©ÖнÏСµÄ£®

½â´ð ½â£ºf£¨x£©ÔÚÇø¼ä$[\begin{array}{l}{2£¬6}\\{\;}\end{array}]$ÉϵÝÔö£¬
Ôòf£¨2£©£¼f£¨6£©£¬
ÓÖf£¨x£©ÔÚÇø¼ä$[\begin{array}{l}{6£¬8}\\{\;}\end{array}]$Éϵݼõ£¬
Ôòf£¨6£©£¾f£¨8£©£¬
¼´ÓÐf£¨6£©ÎªÇø¼ä$[\begin{array}{l}{2£¬8}\\{\;}\end{array}]$ÉϵÄ×î´óÖµ£¬
×îСֵΪf£¨2£©ºÍf£¨8£©ÖнÏСµÄÒ»¸ö£®
¹ÊÑ¡C£®

µãÆÀ ±¾Ì⿼²éº¯ÊýµÄ×îÖµµÄÇ󷨣¬Ö÷Òª¿¼²éº¯ÊýµÄµ¥µ÷ÐÔµÄÓ¦Óã¬ÊôÓÚ»ù´¡Ì⣮

Á·Ï°²áϵÁдð°¸
Ïà¹ØÏ°Ìâ

¿ÆÄ¿£º¸ßÖÐÊýѧ À´Ô´£º ÌâÐÍ£º½â´ðÌâ

20£®Ö¤Ã÷£º1+$\frac{1}{2\sqrt{2}}$+$\frac{1}{3\sqrt{3}}$+¡­+$\frac{1}{n\sqrt{n}}$£¼3£¨n¡ÊN*£©

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÊýѧ À´Ô´£º ÌâÐÍ£º½â´ðÌâ

1£®Ö±Ïß1ͨ¹ýµãP£¨1£¬3£©ÇÒÓëÁ½×ø±êÖáµÄÕý°ëÖá½»ÓÚA¡¢BÁ½µã£®
£¨1£©Ö±Ïß1ÓëÁ½×ø±êÖáËùΧ³ÉµÄÈý½ÇÐÎÃæ»ýΪ6£¬ÇóÖ±Ïß1µÄ·½³Ì£»
£¨2£©ÇóOA+OBµÄ×îСֵ£»
£¨3£©ÇóPA•PBµÄ×îСֵ£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÊýѧ À´Ô´£º ÌâÐÍ£ºÑ¡ÔñÌâ

18£®É輯ºÏM={x|1¡Üx¡Ü5}£¬N={x|3¡Üx¡Ü6}£¬M¡ÈNµÈÓÚ£¨¡¡¡¡£©
A£®{x|3¡Üx¡Ü5}B£®{x|1¡Üx¡Ü6}C£®{x|1¡Üx¡Ü3}D£®{x|3¡Üx¡Ü6}

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÊýѧ À´Ô´£º ÌâÐÍ£ºÌî¿ÕÌâ

5£®º¯Êýf£¨x£©=2|x-1|+|x+3|µÄµ¥µ÷ÔöÇø¼äΪ[1£¬+¡Þ£©£¬µ¥µ÷¼õÇø¼äΪ£¨-¡Þ£¬1]£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÊýѧ À´Ô´£º ÌâÐÍ£ºÑ¡ÔñÌâ

15£®ÒÑÖª¶¨ÒåÔÚRÉϵĺ¯Êýy=f£¨x£©Âú×㣺¢Ù¶ÔÓÚÈÎÒâµÄx¡ÊR£¬¶¼ÓÐf£¨x+2£©=-$\frac{1}{f£¨x£©}$£»¢Úº¯Êýy=f£¨x+2£©ÊÇżº¯Êý£»¢Ûµ±x¡Ê£¨0£¬2]ʱ£¬f£¨x£©=ex-$\frac{1}{x}$£¬Éèa=f£¨-5£©£¬b=f£¨$\frac{19}{2}$£©£¬c=f£¨$\frac{41}{4}$£©£¬Ôòa£¬b£¬cµÄ´óС¹ØÏµ£¨¡¡¡¡£©
A£®b£¼a£¼cB£®c£¼a£¼bC£®b£¼c£¼aD£®a£¼b£¼c

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÊýѧ À´Ô´£º ÌâÐÍ£ºÑ¡ÔñÌâ

2£®ÔÚ¡÷ABCÖУ¬±ßa¡¢b¡¢cµÄ¶Ô½Ç·Ö±ðΪA¡¢B¡¢C£¬ÇÒA=2B£¬a=$\frac{3}{2}$b£¬cosB=£¨¡¡¡¡£©
A£®$\frac{1}{2}$B£®$\frac{1}{3}$C£®$\frac{2}{3}$D£®$\frac{3}{4}$

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÊýѧ À´Ô´£º ÌâÐÍ£ºÌî¿ÕÌâ

19£®º¯Êýf£¨$\sqrt{x}$£©=x-1µÄ×îСֵÊÇ-1£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÊýѧ À´Ô´£º ÌâÐÍ£ºÌî¿ÕÌâ

20£®ÒÑÖªº¯Êýf£¨x£©=$\frac{\root{3}{x-4}}{a{x}^{2}+4ax+3}$µÄ¶¨ÒåÓòÊÇʵÊý¼¯R£¬ÔòʵÊýaµÄȡֵ·¶Î§ÊÇ[0£¬$\frac{3}{4}$£©£®

²é¿´´ð°¸ºÍ½âÎö>>

ͬ²½Á·Ï°²á´ð°¸