Znn3bq.jpeg
²é¿´: 1766  |  »Ø¸´: 9
µ±Ç°Ö»ÏÔʾÂú×ãÖ¸¶¨Ìõ¼þµÄ»ØÌû£¬µã»÷ÕâÀï²é¿´±¾»°ÌâµÄËùÓлØÌû

ÄäÃû

Óû§×¢Ïú (ÕýʽдÊÖ)

±¾Ìû½öÂ¥Ö÷¿É¼û

» ²ÂÄãϲ»¶

» ±¾Ö÷ÌâÏà¹Ø¼ÛÖµÌùÍÆ¼ö£¬¶ÔÄúͬÑùÓаïÖú:

ÒÑÔÄ   ͬ·½Ïò¹ã²¥   ÉêÇëÊýѧEPI   »Ø¸´´ËÂ¥   ±à¼­   ²é¿´ÎÒµÄÖ÷Ò³

zywang1999

Òø³æ (СÓÐÃûÆø)

¡¾´ð°¸¡¿Ó¦Öú»ØÌû

¡ï ¡ï ¡ï ¡ï ¡ï
¸Ðл²ÎÓ룬ӦÖúÖ¸Êý +1
zz3476: ½ð±Ò+5, ¡ï¡ï¡ïºÜÓаïÖú, Äã×îºóÒ»¸ö´ð°¸ÊǶԵġ£ÎÒ¾õµÃËäÈ»ÄãµÃ³öÁ˺ܶàµÄÖ±Ïß·½³Ì£¬µ«ËüÃÇÆäʵ¶¼±íʾһÌõÖ±Ïß¡£ 2014-04-12 20:13:33
ÒÀÌâÒ⣬ÉèËùÇóÖ±ÏßÓëL1½»ÓÚB(s, 3s+5, 2s-3), ÓëL2½»ÓÚC(t, 4t-7, 5t+10)¡£ÔòA(-3,5,-9)¡¢B¡¢C¹²Ïߣ¬
AB || AC¡£¹Ê
(s+3)/(t+3) = 3s/(4t-12) = (2s+6)/(5t+19)    =k(kΪ´ý¶¨³£Êý)
s+3 = kt+3k, 3s = 4kt - 12k, 2s+6 = 5kt + 19k
4/3kt - 4k + 3 = kt + 3k,  5kt+19k = 2kt+6k
1/3kt + 3 = 7k, 3kt + 13k = 0
t = -13/3
Ö±Ïß·½³ÌΪ£º(x+3)/(-4/3) = (y-5)/(-88/3) = (z+9)/(-8/3)
(x+3)/4 = (y-5)/88 = (z+9)/8
(x+3) = (y-5)/22 = (z+9)/2
´ð°¸Ó¦¸Ã²»Î¨Ò»¡£¼ìÑéµÄ°ì·¨ÊÇ´úÈ룬¿´ÊÇ·ñÂú×ãÌõ¼þ
ÎÒÊÇÕâôÉî°®Äã°¡£¬ÎÒµÄÖйú
5Â¥2014-04-10 17:56:32
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
²é¿´È«²¿ 10 ¸ö»Ø´ð

Apple.D.

½ð³æ (ÕýʽдÊÖ)

¡¾´ð°¸¡¿Ó¦Öú»ØÌû

¸Ðл²ÎÓ룬ӦÖúÖ¸Êý +1
´ð°¸ÊDz»ÊÇy=22x+71ºÍz=2x-3£¿
2Â¥2014-04-10 15:54:32
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

ÄäÃû

Óû§×¢Ïú (ÕýʽдÊÖ)

±¾Ìû½öÂ¥Ö÷¿É¼û
3Â¥2014-04-10 16:25:57
ÒÑÔÄ   ÉêÇëÊýѧEPI   »Ø¸´´ËÂ¥   ±à¼­   ²é¿´ÎÒµÄÖ÷Ò³

Apple.D.

½ð³æ (ÕýʽдÊÖ)

ÒýÓûØÌû:
3Â¥: Originally posted by zz3476 at 2014-04-10 16:25:57
µÚ¶þ¸ö¶Ô£¬µÚÒ»¸ö²»¶Ô
...

sorry!Âí»¢ÁË£¬Ó¦¸ÃÊÇy=4x-7ºÍz=2x-3£¬Éè·½³Ìy=ax+b...£¨1£©ºÍz=cx+d...£¨2£©£¬½«Aµã´øÈë·½³Ì(1)ºÍ(2)ÖУ¬µÃµ½·½³Ìy=ax-3a+5...(3)ºÍz=cx+3c-9...(4)£¬ÉèÓÚÖ±ÏßL1ºÍL2µÄ½¹µã·Ö±ðΪB1(x1,y1,z1)ºÍB2(x2,y2,z2),·Ö±ð´øÈëֱдL1ºÍL2ÖУ¬ÓÉL1µÃ2x1-3=cx1+3c-9,µÃµ½c=2£¬ÓÉL2µÃ4x2-7=ax2-3a+5,µÃµ½a=4£¬½«aºÍcµÄÖµ´øµ½·½³Ì£¨1£©ºÍ£¨2£©ÖУ¬µÃµ½½á¹û¡£
4Â¥2014-04-10 17:00:52
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
×î¾ßÈËÆøÈÈÌûÍÆ¼ö [²é¿´È«²¿] ×÷Õß »Ø/¿´ ×îºó·¢±í
[¿¼ÑÐ] 291Çóµ÷¼Á +10 ¹ØÒä±±. 2026-04-14 10/500 2026-04-18 23:32 by ·²¡Çé
[¿¼ÑÐ] ½ÓÊÜÈκε÷¼Á +6 Ò²¾ÍÊÇÀõ×Ó 2026-04-17 7/350 2026-04-18 17:20 by º­ÖñÁõ
[¿¼ÑÐ] »¯Ñ§070300 Çóµ÷¼Á +29 ¹þ¹þ¹þ^_^ 2026-04-12 29/1450 2026-04-18 15:56 by Equinoxhua
[¿¼ÑÐ] 295·ÖÇóµ÷¼Á +5 ?ÒªÉϰ¶? 2026-04-17 5/250 2026-04-17 16:51 by fenglj492
[¿¼ÑÐ] 294Çóµ÷¼Á +7 µ­È»654321 2026-04-17 8/400 2026-04-17 16:36 by wutongshun
[¿¼ÑÐ] 294Çóµ÷¼Á +14 µ­È»654321 2026-04-15 14/700 2026-04-16 21:01 by lpl364211
[¿¼ÑÐ] Ò»Ö¾Ô¸»¦9£¬ÉúÎïѧ326Çóµ÷¼Á +9 Áõīī 2026-04-15 9/450 2026-04-16 17:14 by ´Þ´Þ´Þcccc
[¿¼²©] É격×Ô¼ö +3 LinxiaÁÖÏÄ 2026-04-13 3/150 2026-04-16 12:55 by Ä«ºÉ֮¶
[¿¼ÑÐ] ҩѧÇóµ÷¼Á +14 à¶¹þ¼ÓÓÍ 2026-04-14 16/800 2026-04-16 10:15 by beilsong20
[¿¼ÑÐ] 289 ·Ö105500ҩѧר˶Çóµ÷¼Á(ÕÒBÇøÑ§Ð£) +4 °×ÔÆ123456789 2026-04-13 4/200 2026-04-16 00:18 by ·ÛÇßÈô³¾
[¿¼ÑÐ] Çóµ÷¼ÁѧУ +14 ²»»á³ÔÈâ 2026-04-13 16/800 2026-04-15 21:59 by noqvsozv
[¿¼ÑÐ] 297¹¤¿Æµ÷¼Á? +14 ºÓÄÏũҵ´óѧ-ÄÜ 2026-04-13 15/750 2026-04-15 13:25 by ºÚ¿Æ¼¼¿óÒµ
[½Ìʦ֮¼Ò] ת³¤Æ¸ÁË +7 ¼òµ¥»¯xn 2026-04-13 7/350 2026-04-14 14:50 by xindong
[¿¼ÑÐ] ¿¼Ñе÷¼Á +13 ³¤¹­°Á 2026-04-13 14/700 2026-04-14 14:44 by zs92450
[¿¼ÑÐ] 085408¹âµçÐÅÏ¢¹¤³Ìר˶355Ò»Ö¾Ô¸³¤´º¹â»úËùµ÷¼Á +6 Íõymaa 2026-04-13 13/650 2026-04-14 11:33 by Íõymaa
[¿¼ÑÐ] Çóµ÷¼Á +3 ÎÒ°®¸ßÊý¸ßÊý°®Î 2026-04-12 3/150 2026-04-14 01:00 by Íõ¬Bè±
[¿¼ÑÐ] ¿¼ÑÐÓ¢Ò»ÊýÒ»338·Ö +9 ³¤½­´óѧ¶«Ð£Çø 2026-04-13 10/500 2026-04-14 00:41 by Íõ¬Bè±
[¿¼ÑÐ] BÇø0809 £¬ÊýÒ»Ó¢Ò»£¬290 Çóµ÷¼Á +3 ãöΫ1111 2026-04-12 4/200 2026-04-13 20:35 by ѧԱJpLReM
[¿¼ÑÐ] Ò»Ö¾Ô¸085802 323·ÖÇóµ÷¼Á +13 drizzle_9 2026-04-12 14/700 2026-04-13 10:26 by Faiz5552
[¿¼ÑÐ] µ÷¼Á½áÊø +6 floriea 2026-04-12 8/400 2026-04-12 18:13 by zhouxiaoyu
ÐÅÏ¢Ìáʾ
ÇëÌî´¦ÀíÒâ¼û