ÌâÄ¿ÄÚÈÝ

ÏÂÁÐËÄÖÖ˵·¨£º
£¨1£©ÃüÌ⣺¡°´æÔÚx¡ÊR£¬Ê¹µÃx2+1£¾3x¡±µÄ·ñ¶¨ÊÇ¡°¶ÔÈÎÒâx¡ÊR£¬¶¼ÓÐx2+1¡Ü3x¡±£®
£¨2£©ÈôÖ±Ïßa¡¢bÔÚƽÃæ¦ÁÄÚµÄÉäÓ°»¥Ïà´¹Ö±£¬Ôòa¡Íb£®
£¨3£©ÒÑÖªÒ»×éÊý¾ÝΪ20¡¢30¡¢40¡¢50¡¢60¡¢70£¬ÔòÕâ×éÊý¾ÝµÄÖÚÊý¡¢ÖÐλÊý¡¢Æ½¾ùÊýµÄ´óС¹ØϵÊÇ£ºÖÚÊý£¾ÖÐλÊý£¾Æ½¾ùÊý£®
£¨4£©ÒÑÖª»Ø¹é·½³Ì
?
y
=4.4x+838.19
£¬Ôò¿É¹À¼ÆxÓëyµÄÔö³¤ËÙ¶ÈÖ®±ÈԼΪ
5
22
£®
£¨5£©ÈôA£¨-2£¬3£©£¬B£¨3£¬-2£©£¬C£¨
1
2
£¬m£©Èýµã¹²Ïߣ¬ÔòmµÄֵΪ2£®
ÆäÖÐËùÓÐÕýȷ˵·¨µÄÐòºÅÊÇ
 
£®
·ÖÎö£ºÀûÓú¬Á¿´ÊµÄÃüÌâµÄ·ñ¶¨ÐÎʽÅжϳö£¨1£©¶Ô£»¾Ý»­³öÖ±ÏßµÄλÖùØϵÅжϳö£¨2£©´í£»¾ÝÊý¾ÝÌØÕ÷ÊýµÄÇó·¨Åжϳö£¨3£©´í£»¸øxÔö¼ÓÒ»¸öµ¥Î»¾Ý»Ø¹éÖ±Ïß·½³ÌÇó³öyµÄ±ä»¯Á¿£¬Çó³öxÓëyµÄÔö³¤ËÙ¶ÈÖ®±È£¬Åжϳö£¨4£©´í£»¾ÝÈýµã¹²Ïßת»¯ÎªÁ½ÏòÁ¿¹²Ïߣ¬ÀûÓÃÏòÁ¿¹²ÏߵijäÒªÌõ¼þÇó³ömµÄ·¶Î§£¬Åжϳö£¨5£©´í£®
½â´ð£º½â£º¶ÔÓÚ£¨1£©¸ù¾Ýº¬Á¿´ÊµÄÃüÌâµÄ·ñ¶¨£¬½«Á¿´Ê½»»»Í¬Ê±½«½áÂÛ·ñ¶¨£¬µÃµ½£¨1£©¶Ô
¶ÔÓÚ£¨2£©µ±Á½ÌõÖ±Ïßб½»Ê±£¬Á½Ö±ÏßÔÚͬһ¸öƽÃæµÄÉäÓ°Ò²ÓпÉÄÜ´¹Ö±£¬¹Ê£¨2£©´í
¶ÔÓÚ£¨3£©Õâ×éÊý¾ÝµÄÖÚÊýΪ20£¬30£¬40£¬50£¬60£¬70¹²6¸öÖµ£¬ÖÐλÊýΪ
50+60
2
=55
£¬
ƽ¾ùÊýΪ
20+30+40+50+60+70
6
=45
¹Ê£¨3£©´í
¶ÔÓÚ£¨4£©xÿÔö¼ÓÒ»¸öµ¥Î»£¬yƽ¾ùÔö¼Ó4£¬.4£¬ËùÒÔxÓëyµÄÔö³¤ËÙ¶ÈÖ®±ÈԼΪ
1
4.4
=
5
22
£¬¹Ê£¨4£©¶Ô
¶ÔÓÚ£¨5£©A¡¢B¡¢CÈýµã¹²Ïߣ¬Ôò
AB
¡Î
AC

AB
=(5£¬-5)  £¬
AC
=(
5
2
£¬m-3)
£¬¡à5(m-3)=-5¡Á
5
2
£¬¡àm=
1
2
¹Ê£¨5£©´í
¹Ê´ð°¸Îª£¨1£©£¨4£©
µãÆÀ£º½â¾öº¬Á¿´ÊµÄÃüÌâµÄ·ñ¶¨£¬Ö»Ð轫Á¿´Ê»¥»»£¬½áÂÛ·ñ¶¨¼´¿É£»½â¾öÈýµã¹²ÏßÎÊÌⳣת»¯ÎªÁ½¸öÏòÁ¿¹²ÏßÎÊÌ⣬ÀûÓÃÏòÁ¿¹ØϵµÄ³äÒªÌõ¼þÀ´½â¾ö£®
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿

Î¥·¨ºÍ²»Á¼ÐÅÏ¢¾Ù±¨µç»°£º027-86699610 ¾Ù±¨ÓÊÏ䣺58377363@163.com

¾«Ó¢¼Ò½ÌÍø