Íê³ÉÏÂÃæµÄ½âÌâ¹ý³Ì£º
£¨1£©ÓÃÖ±½Ó¿ªÆ½·½·¨½â·½³Ì£º2£¨x-3£©2-6=0£»
½â£ºÔ­·½³Ì»¯³É
 
£®
¿ªÆ½·½£¬µÃ
 
£¬
x1=
 
£¬x2=
 
£®
£¨2£©ÓÃÅä·½·¨½â·½³Ì£º3x2-x-4=0£»
½â£ºÒÆÏµÃ
 
£®
¶þ´ÎÏîϵÊý»¯Îª1£¬µÃ
 
£®
Åä·½
 
£¬
 
£®
¿ªÆ½·½£¬µÃ
 
£¬
x1=
 
£¬x2=
 
£®
£¨3£©Óù«Ê½·¨½â·½³Ì£ºx£¨2x-4£©=2.5-8x£®
½â£ºÕûÀí£¬µÃ
 
£®
a=
 
£¬b=
 
£¬c=
 
£®
b2-4ac=
 
=
 
£¾0£®
x=
-b¡À
b2-4ac
2a
=
 
=
 
£¬
x1=
 
£¬x2=
 
£®
£¨4£©ÓÃÒòʽ·Ö½â·¨½â·½³Ì£ºx£¨x+2£©=3x+6£®
½â£ºÒÆÏµÃ
 
£®
Òòʽ·Ö½â£¬µÃ
 
£®
ÓÚÊǵÃ
 
»ò
 
£¬
x1=
 
£¬x2=
 
£®
·ÖÎö£º£¨1£©¿ªÆ½·½·¨Ðèת»¯³Éx2=m£¨m¡Ý0£©µÄÐÎʽ£¬ÔÙ¸ù¾Ýƽ·½¸ùµÄ¶¨ÒåÇó½â£¬Èôm£¼0Ôò·½³ÌÎ޽⣻£¨2£©Åä·½·¨¹Ø¼üÒª°Ñ¶þ´ÎÏîϵÊý»¯Îª1ÒÔºó£¬Á½±ß¶¼¼ÓÉÏÒ»´ÎÏîϵÊýÒ»°ëµÄƽ·½£¬ÔÙÔËÓÿªÆ½·½·¨Çó½â£»£¨3£©¹«Ê½·¨ÊÊÓÃËùÓеÄÒ»Ôª¶þ´Î·½³ÌÇó½â£»£¨4£©Òòʽ·Ö½â·¨Ðè°Ñ×ó±ß»¯³ÉÒòʽµÄ»ý£¬ÓÒ±ßΪ0µÄÐÎʽÔÙÇó½â£®
½â´ð£º½â£º£¨1£© 2£¨x-3£©2-6=0£¬
£¨x-3£©2=3£¬
x-3=¡À
3
£¬
x1=3+
3
£¬x2=3-
3
£®

£¨2£©3x2-x-4=0£¬
3x2-x=4£»
x2-
1
3
x=
4
3
£»
x2-
1
3
x+£¨
1
6
£©2=
4
3
+
1
36
£¬
£¨x-
1
6
£©2=
49
36
£»
x-
1
6
=¡À
7
6
£»
x1=
4
3
£¬x2=-1£®

£¨3£© x£¨2x-4£©=2.5-8x£®
x2+2x-
5
4
=0£»
a=1£¬b=2 c=-
5
4
£»
b2-4ac=22-4¡Á1¡Á£¨-
5
4
£©=9£®
x=
-b¡À
b2-4ac
2a
=
-2¡À
9
2
=
-2¡À3
2
£¬
x1=
1
2
£¬x2=-
5
2
£®

£¨4£© x£¨x+2£©=3x+6£®
x£¨x+2£©-3£¨x+2£©=0£®£¨x+2£©£¨x-3£©=0x+2=0»òx-3=0£¬
x1=-2£¬x2=3£®
µãÆÀ£º´ËÌ⿼²éÁ˽âÒ»Ôª¶þ´Î·½³ÌµÄ¼¸ÖÖ»ù±¾·½·¨¼°¸÷ÖֽⷨµÄÒ»°ã²½Ö裬Êô»ù´¡Ì⣮
Á·Ï°²áϵÁдð°¸
Ïà¹ØÏ°Ìâ

¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º ÌâÐÍ£º

Íê³ÉÏÂÃæµÄ½âÌâ¹ý³Ì£º
£¨1£©½â·½³Ì£º2x2-6=0£»
½â£ºÔ­·½³Ì»¯³É
 
£®
¿ªÆ½·½£¬µÃ
 
£¬
x1=
 
£¬x2=
 
£®
£¨2£©½â·½³Ì£º9£¨x-2£©2=1£®
½â£ºÔ­·½³Ì»¯³É
 
£®
¿ªÆ½·½£¬µÃ
 
£¬
x1=
 
£¬x2=
 
£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º ÌâÐÍ£º

Íê³ÉÏÂÃæµÄ½âÌâ¹ý³Ì£º
ÓÃÅä·½·¨½â·½³Ì£º3x2+6x+2=0£®
½â£ºÒÆÏµÃ
 
£®
¶þ´ÎÏîϵÊý»¯Îª1£¬µÃ
 
£®
Åä·½
 
£¬
 
£®
¿ªÆ½·½£¬µÃ
 
£¬
x1=
 
£¬x2=
 
£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º ÌâÐÍ£º

Íê³ÉÏÂÃæµÄ½âÌâ¹ý³Ì£º
ÓÃÅä·½·¨½â·½³Ì£º£¨2x-1£©2=4x+9£®
½â£ºÕûÀí£¬µÃ
 
£®
ÒÆÏµÃ
 
£®
¶þ´ÎÏîϵÊý»¯Îª1£¬µÃ
 
£®
Åä·½
 
£¬
 
£®
¿ªÆ½·½£¬µÃ
 
£¬
x1=
 
£¬x2=
 
£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º ÌâÐÍ£º

Íê³ÉÏÂÃæµÄ½âÌâ¹ý³Ì£º
Óù«Ê½·¨½âÏÂÁз½³Ì£º
£¨1£©2x2-3x-2=0£®
½â£ºa=
 
£¬b=
 
£¬c=
 
£®
b2-4ac=
 
=
 
£¾0£®
x=
-b¡À
b2-4ac
2a
=
 
=
 
£¬
x1=
 
£¬x2=
 
£®
£¨2£©x£¨2x-
6
£©=
6
x-3£®
½â£ºÕûÀí£¬µÃ
 
£®
a=
 
£¬b=
 
£¬c=
 
£®
b2-4ac=
 
=
 
£®
x=
-b¡À
b2-4ac
2a
=
 
=
 
£¬
x1=x2=
 
£®
£¨3£©£¨x-2£©2=x-3£®
½â£ºÕûÀí£¬µÃ
 
£®
a=
 
£¬b=
 
£¬c=
 
£®
b2-4ac=
 
=
 
£¼0£®
·½³Ì
 
ʵÊý¸ù£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º ÌâÐÍ£º

6¡¢Íê³ÉÏÂÃæµÄ½âÌâ¹ý³Ì£º
ij¹«Ë¾½ñÄêÀûÈóÔ¤¼ÆÊÇ300ÍòÔª£¬ºóÄêÀûÈóÒª´ïµ½450ÍòÔª£¬¸Ã¹«Ë¾ÀûÈóµÄÄêƽ¾ùÔö³¤ÂÊÊǶàÉÙ£¿
½â£ºÉè¸Ã¹«Ë¾ÀûÈóµÄÄêƽ¾ùÔö³¤ÂÊÊÇx£®
¸ù¾ÝÌâÒâÁз½³Ì£¬µÃ
300£¨1+x£©2=450
£®
½â·½³Ì£¬µÃx1¡Ö
22%
£¬x2¡Ö
-122%
£¨²»ºÏÌâÒ⣬ÉáÈ¥£©£®
´ð£º¸Ã¹«Ë¾ÀûÈóµÄÄêƽ¾ùÔö³¤ÂÊÊÇ
22
%£®

²é¿´´ð°¸ºÍ½âÎö>>

ͬ²½Á·Ï°²á´ð°¸