Znn3bq.jpeg
ÉÇÍ·´óѧº£Ñó¿ÆÑ§½ÓÊܵ÷¼Á
²é¿´: 1206  |  »Ø¸´: 6
µ±Ç°Ö»ÏÔʾÂú×ãÖ¸¶¨Ìõ¼þµÄ»ØÌû£¬µã»÷ÕâÀï²é¿´±¾»°ÌâµÄËùÓлØÌû

lilihurry

Òø³æ (СÓÐÃûÆø)

[ÇóÖú] Çë´óʦ°ïæ½â¾öÒ»¸öº¯ÊýȡֵÎÊÌ⣬лл£¡

ÉèÈý½ÇÐÎABCµÄÈýÄÚ½ÇΪ£ºA,B,C£¬Âú×ãA+C=2B£¬ÇócosAcosCȡֵ·¶Î§
»Ø¸´´ËÂ¥

» ²ÂÄãϲ»¶

» ±¾Ö÷ÌâÏà¹Ø¼ÛÖµÌùÍÆ¼ö£¬¶ÔÄúͬÑùÓаïÖú:

ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

maolo927

Òø³æ (ÕýʽдÊÖ)

¡¾´ð°¸¡¿Ó¦Öú»ØÌû

¸Ðл²ÎÓ룬ӦÖúÖ¸Êý +1
¿´ËƼòµ¥£¬ÊµÓÐÏÝÚå¡£
³ÏÈç¶þÂ¥ËùÑÔ£¬¡¡-1/2<y(º¯ÊýÖµ£©<1/4
µ« A¡¢BÊÇÈý½ÇÐÎÄڽǣ¬²»µÃΪ0,ËùÒÔÈ¡²»µ½±ß½çÖµ£¬ËÆÎÞ×îÖµ¡£
5Â¥2013-11-16 08:56:11
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
²é¿´È«²¿ 7 ¸ö»Ø´ð

feixiaolin

ÈÙÓþ°æÖ÷ (ÎÄ̳¾«Ó¢)

ÓÅÐã°æÖ÷

A+C=2B£»
A+C+B=3B=pi£»
A+C=2/3*pi
cosAcosC=0.5*[cos(A+C)+cos(A-C)]
=0.5*[-0.5+cos(A-C)]
max=0.5*[-0.5+1.0]=0.25;
min=0.5*[-0.5-0.5]=-0.5;
2Â¥2013-11-15 15:30:27
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

Á«¶¯²¨¹âºÆÔÂ

ľ³æ (СÓÐÃûÆø)

¡¾´ð°¸¡¿Ó¦Öú»ØÌû

¡ï ¡ï ¡ï ¡ï ¡ï
¸Ðл²ÎÓ룬ӦÖúÖ¸Êý +1
lilihurry: ½ð±Ò+5 2013-11-18 12:13:58
2Â¥×îСֵȡ²»µ½£¡
3Â¥2013-11-15 16:01:10
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

lilihurry

Òø³æ (СÓÐÃûÆø)

ÒýÓûØÌû:
2Â¥: Originally posted by feixiaolin at 2013-11-15 15:30:27
A+C=2B£»
A+C+B=3B=pi£»
A+C=2/3*pi
cosAcosC=0.5*
=0.5*
max=0.5*=0.25;
min=0.5*=-0.5;

ÇëÎÊcos(A-C)ÔõôµÈÓÚ-0.5µÄ£¿
6Â¥2013-11-18 09:34:08
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
×î¾ßÈËÆøÈÈÌûÍÆ¼ö [²é¿´È«²¿] ×÷Õß »Ø/¿´ ×îºó·¢±í
[¿¼ÑÐ] 274Çóµ÷¼Á +9 ɽ°¢Âû 2026-04-07 9/450 2026-04-14 10:26 by dick_runner
[¿¼ÑÐ] Çóµ÷¼Á +8 СÄô°®Ñ§Ï° 2026-04-11 11/550 2026-04-14 09:23 by 1587964
[¿¼ÑÐ] ÉúÎïѧ308Çóµ÷¼Á +6 ÏàÐűػá¹ââÍòÕ 2026-04-11 6/300 2026-04-14 08:57 by licg0208
[¿¼ÑÐ] ²ÄÁÏ085601µ÷¼Á +32 ºÎÈó²É123 2026-04-10 34/1700 2026-04-14 08:47 by ľľmumu¡«
[¿¼ÑÐ] 327Çóµ÷¼Á +21 Xxjc1107. 2026-04-13 23/1150 2026-04-13 21:53 by bljnqdcc
[¿¼ÑÐ] һ־Ը˫·Ç085400µç×ÓÐÅÏ¢344 Çóµ÷¼Á£¬¶Ô²ÄÁϺͻ¯Ñ§·½ÏòÒ²¸ÐÐËȤ +12 ÎÞÇéµÄСÑò 2026-04-09 13/650 2026-04-13 14:17 by ÕÅzhihao
[¿¼ÑÐ] һ־Ը³¶«´óѧ071000ÉúÎïѧѧ˶³õÊÔ·ÖÊý276Çóµ÷¼Á +8 Ľ¾øcc 2026-04-09 8/400 2026-04-13 14:08 by ÕÅzhihao
[¿¼ÑÐ] 314Çóµ÷¼Á +24 wakeluofu 2026-04-09 25/1250 2026-04-13 08:58 by lhj2009
[¿¼ÑÐ] 339Çóµ÷¼Á +8 hanwudada 2026-04-11 9/450 2026-04-12 15:36 by laoshidan
[¿¼ÑÐ] 331Çóµ÷¼Á +5 Íõ¹ú˧ 2026-04-11 5/250 2026-04-11 22:56 by Ϫ½§Á÷Ë®
[¿¼ÑÐ] 283Çóµ÷¼Á 086004¿¼Ó¢¶þÊý¶þ +17 ÄǸöàà×Ó 2026-04-10 18/900 2026-04-11 16:27 by Ã÷Ô´ËʱÓÐ
[¿¼ÑÐ] 275Çóµ÷¼Á +9 1624447980 2026-04-08 10/500 2026-04-11 10:20 by Delta2012
[¿¼ÑÐ] 293Çóµ÷¼Á +6 ÓÂÔ¶¿â°®314 2026-04-08 6/300 2026-04-11 10:08 by zhq0425
[¿¼ÑÐ] 22408 352·ÖÇóµ÷¼Á0854Àà +4 ŬÁ¦µÄÏÄÄ© 2026-04-09 4/200 2026-04-11 09:57 by zhq0425
[¿¼ÑÐ] »¯Ñ§¹¤³ÌÓë¼¼Êõ324µ÷¼Á +23 Ëï³£»ª 2026-04-09 25/1250 2026-04-11 00:07 by ÆïÅ£¶Éº®½­
[¿¼ÑÐ] Çóµ÷¼Á +5 ²»»á·ÉµÄÓã@ 2026-04-10 5/250 2026-04-10 19:07 by chemisry
[¿¼ÑÐ] 071000ÉúÎïѧµ÷¼ÁÇóÖú +17 zzzzwww 2026-04-09 20/1000 2026-04-10 15:55 by Çóµ÷¼Ázz
[¿¼ÑÐ] 085501»úеӢ¶þ77×Ü·Ö294Çóµ÷¼Á£¬½ÓÊÜ¿çרҵѧϰ +6 ÊØ·¨¹«ÃñØÁ¼Í 2026-04-08 6/300 2026-04-09 15:55 by wp06
[¿¼ÑÐ] Çóµ÷¼Á +3 ÖíÈâ¶Õ·ÛÌõcc 2026-04-08 4/200 2026-04-09 10:05 by ÖíÈâ¶Õ·ÛÌõcc
[¿¼ÑÐ] 263·ÖBÇøÇóµ÷¼Á +6 Àînihao 2026-04-08 6/300 2026-04-08 09:38 by ÄÏ¿ªÐ¡ôë
ÐÅÏ¢Ìáʾ
ÇëÌî´¦ÀíÒâ¼û