9£®Èçͼ1£¬°Ñ±ß³¤ÎªaµÄ´óÕý·½ÐÎֽƬһ½ÇÈ¥µôÒ»¸ö±ß³¤ÎªbµÄСÕý·½ÐÎֽƬ£¬½«ÓàÏÂֽƬ£¨Í¼1ÖеÄÒõÓ°²¿·Ö£©°´ÐéÏ߲ÿªÖØÐÂÆ´³ÉÒ»¸öÈçͼ2µÄ³¤·½ÐÎֽƬ£¨Í¼2ÖÐÒõÓ°²¿·Ö£©£®
Çë½â´ðÏÂÁÐÎÊÌ⣺

£¨1£©¢ÙÉèͼ1ÖеÄÒõÓ°²¿·ÖֽƬµÄÃæ»ýΪS1£¬ÔòS1=a2-b2£»
    ¢Úͼ2Öг¤·½ÐΣ¨ÒõÓ°²¿·Ö£©µÄ³¤±íʾΪa+b£¬¿í±íʾΪa-b£¬Éèͼ2Öг¤·½ÐΣ¨ÒõÓ°²¿·Ö£©µÄÃæ»ýΪS2£¬ÄÇôS2=£¨a+b£©£¨a-b£©£¨¶¼Óú¬a¡¢bµÄ´úÊýʽ±íʾ£©£»
£¨2£©´Óͼ1µ½Í¼2£¬ÄãµÃµ½µÄÒ»¸ö·Ö½âÒòʽµÄ¹«Ê½ÊÇ£ºa2-b2=£¨a+b£©£¨a-b£©£»
£¨3£©ÀûÓÃÕâ¸ö¹«Ê½£¬ÎÒÃÇ¿ÉÒÔ¼ÆË㣺£¨2+1£©£¨22+1£©£¨24+1£©£¨28+1£©£¨216+1£©£¨232+1£©£®
½â£ºÔ­Ê½=£¨2-1£©£¨2+1£©£¨22+1£©£¨24+1£©£¨28+1£©£¨216+1£©£¨232+1£©
=£¨22-1£©£¨22+1£©£¨24+1£©£¨28+1£©£¨216+1£©£¨232+1£©
=£¨24-1£©£¨28+1£©£¨28+1£©£¨216+1£©£¨232+1£©
=£¨28-1£©£¨28+1£©£¨216+1£©£¨232+1£©
=£¨216-1£©£¨216+1£©£¨232+1£©
=£¨232-1£©£¨232+1£©
=264-1
ÔĶÁÉÏÃæµÄ¼ÆËã¹ý³Ì£¬Çë¼ÆË㣺£¨3+1£©£¨32+1£©£¨34+1£©£¨38+1£©£¨316+1£©+0.5£®

·ÖÎö £¨1£©ÀûÓôóÕý·½ÐÎÃæ»ý¼õСÕý·½ÐÎÃæ»ý¼´¿ÉµÃµ½£®
£¨2£©¸ù¾Ý³¤·½ÐÎÃæ»ý¹«Ê½¼´¿ÉÇó³ö£®
£¨3£©ÎªÁË¿ÉÒÔÀûÓÃÆ½·½²î¹«Ê½£¬Ç°ÃæÌí$\frac{1}{2}$£¨3-1£©¼´¿É£®

½â´ð ½â£º£¨1£©¢ÙS1=´óÕý·½ÐÎÃæ»ý-СÕý·½ÐÎÃæ»ý=a2-b2£¬¹Ê´ð°¸Îªa2-b2£®
¢Ú¸ù¾ÝͼÏó³¤Îªa+b£¬¿íΪa-b£¬S2=£¨a+b£©£¨a-b£©£®
¹Ê´ð°¸·Ö±ðΪa+b¡¢a-b¡¢£¨a+b£©£¨a-b£©£®
£¨2£©ÓÉ£¨1£©¿ÉÖªa2-b2=£¨a+b£©£¨a-b£©£¬
¹Ê´ð°¸Îªa2-b2=£¨a+b£©£¨a-b£©£®
£¨3£©Ô­Ê½=$\frac{1}{2}$£¨3-1£©£¨3+1£©£¨32+1£©¡­£¨316+1£©+0.5
=$\frac{1}{2}$£¨32-1£©£¨32+1£©¡­£¨316+1£©+0.5
=$\frac{1}{2}$£¨332-1£©+0.5
=$\frac{1}{2}$¡Á332£®

µãÆÀ ±¾Ì⿼²éÁËÕý·½ÐΡ¢³¤·½ÐεÄÃæ»ý¹«Ê½ÒÔ¼°ÀûÓÃÃæ»ý·¨Ö¤Ã÷ƽ·½²î¹«Ê½£¬Áé»îÔËÓÃÆ½·½²î¹«Ê½ÊǽâÌâµÄ¹Ø¼ü£®

Á·Ï°²áϵÁдð°¸
Ïà¹ØÏ°Ìâ

¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º ÌâÐÍ£º½â´ðÌâ

9£®ÒÑÖª$\sqrt{5}$¡Ö2.236£¬Çó£¨5$\sqrt{\frac{1}{5}}$+$\frac{1}{2}$$\sqrt{80}$£©-£¨$\frac{5}{4}$$\sqrt{\frac{4}{5}}$-$\sqrt{45}$£©µÄ½üËÆÖµ£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º ÌâÐÍ£º½â´ðÌâ

10£®Èô£¨a+b£©2=12£¬£¨a-b£©2=8£¬ÄãÄÜÇó³öabµÄÖµÂð£¿

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º ÌâÐÍ£ºÌî¿ÕÌâ

17£®Èçͼ£¬ÔÚRt¡÷ABCÖУ¬¡ÏBAC=90¡ã£¬¡ÏC=30¡ã£¬ÒÔABΪֱ¾¶×÷°ëÔ²O½»BCÓÚµãD£¬¹ýµãDµÄÇÐÏß½»ACÓÚµãE£¬BE½»¡ÑOÓÚµãF£¬AFµÄÑÓ³¤ÏßÓëDEÏཻÓÚµãP£®ÈôOA=l£¬ÔòEB=$\sqrt{7}$£¬PE=$\frac{12-2\sqrt{3}}{11}$£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º ÌâÐÍ£ºÑ¡ÔñÌâ

4£®Èçͼ£¬BCÊÇ¡ÑOÖ±¾¶£¬AÊÇÔ²ÖÜÉÏÒ»µã£¬°Ñ¡÷ABCÈÆµãC˳ʱÕëÐýתµÃ¡÷EDC£¬Á¬½áBD£¬µ±BD¡ÎACʱ£¬¼ÇÐýת½ÇΪx¶È£¬Èô¡ÏABC=y¶È£¬ÔòyÓëxÖ®¼äÂú×ãµÄº¯Êý¹ØÏµÊ½Îª£¨¡¡¡¡£©
A£®y=180-2xB£®y=$\frac{1}{2}$x+90C£®y=2xD£®y=$\frac{1}{2}$x

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º ÌâÐÍ£º½â´ðÌâ

14£®Èçͼ£¬ÔÚÆ½ÃæÖ±½Ç×ø±êϵÖУ¬¶þ´Îº¯Êýy=x2+bx+cµÄͼÏóÓëxÖá½»ÓÚA¡¢BÁ½µã£¬AµãÔÚÔ­µãµÄ×ó²à£¬BµãµÄ×ø±êΪ£¨3£¬0£©£¬ÓëyÖá½»ÓÚC£¨0£¬-3£©µã£®
£¨1£©ÇóÕâ¸ö¶þ´Îº¯ÊýµÄ½âÎöʽ£»
£¨2£©ÈôÅ×ÎïÏߵĶ¥µãΪµãD£¬Çó¡÷BCDµÄÃæ»ý£»
£¨3£©ÉèMÊÇ£¨1£©ËùµÃÅ×ÎïÏßÉϵÚËÄÏóÏÞÄÚµÄÒ»¸ö¶¯µã£¬¹ýµãM×÷Ö±Ïßl¡ÍxÖá½»ÓÚµãF£¬½»Ö±ÏßBCÓÚµãN£®ÊÔÎÊ£ºÏß¶ÎMNµÄ³¤¶ÈÊÇ·ñ´æÔÚ×î´óÖµ£¿Èô´æÔÚ£¬Çó³öËüµÄ×î´óÖµ¼°´ËʱMµãµÄ×ø±ê£»Èô²»´æÔÚ£¬Çë˵Ã÷ÀíÓÉ£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º ÌâÐÍ£ºÌî¿ÕÌâ

1£®ÔÚÈçͼËùʾµÄÖ±½Ç×ø±êϵÖУ¬¡÷AOB¾­¹ýÆ½ÒÆºóµÃµ½¡÷A1O1B1£¨Á½¸öÈý½ÇÐεĶ¥µã¶¼ÔÚ¸ñµãÉÏ£©£¬ÒÑÖªÔÚAOÉÏÒ»µãP£¬Æ½ÒƺóµÃµ½A1O1ÉÏÒ»µãP1£¨-3.5£¬-2£©£¬ÔòPµãµÄ×ø±êΪ£¨0.5£¬1£©£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º ÌâÐÍ£º½â´ðÌâ

18£®Éú»îÖд¦´¦ÓÐÊýѧ£¬±í£¨1£©ÊÇijÔµÄÈÕÀú±í£¬Ïñ±íÖÐÄÇÑùÓÃÒ»¸ö³¤·½Ðοòס9¸öÊý£®

¢ÙÔÚ±í£¨1£©ÖпòסµÄ¾Å¸öÊýÖ®ºÍ×îСÊÇ99£»
¢ÚÈô¿òסµÄ¾Å¸öÊýÖ®ºÍΪ126£¬ÇóÆäÖÐ×î´óµÄÒ»Êý£»
¢Û½«×ÔÈ»Êý1-2015°´±í£¨2£©µÄ·½Ê½ÅÅÁУ¬ÓÃÉÏÃæÍ¬ÑùµÄ·½Ê½¿òס¾Å¸öÊý£¬ÆäºÍÄܲ»ÄܵÈÓÚ2015£¿Çó³ö¸Ã¿òÖÐ×îÖмäµÄÒ»¸öÊý£»Èô²»ÄÜ£¬Çë˵Ã÷ÀíÓÉ£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º ÌâÐÍ£ºÑ¡ÔñÌâ

19£®¶ÔÓÚÅ×ÎïÏßy=x2+2x-3£¬ÏÂÁнáÂÛ´íÎóµÄÊÇ£¨¡¡¡¡£©
A£®¶¥µã×ø±êÊÇ£¨-1£¬-4£©B£®¶Ô³ÆÖáÊÇÖ±Ïßx=-4
C£®ÓëxÖáµÄ½»µã×ø±êÊÇ£¨-3£¬0£©£¬£¨1£¬0£©D£®ÓëyÖáµÄ½»µã×ø±êÊÇ£¨0£¬-3£©

²é¿´´ð°¸ºÍ½âÎö>>

ͬ²½Á·Ï°²á´ð°¸