如图,A1B1、A2B2…、A5B5是斜拉桥上的钢索,它们在一个平面上,A1、A2、A3、A4、A5是间隔均匀地固定在高塔上 如图,梯形各横木间互相平行,且A1A2=A2A3=A3A4=...
\u5982\u56fe\uff0cA1B1\u3001A2B2\u3001...\u3001A5B5\u662f\u659c\u62c9\u6865\u4e0a\u7684\u94a2\u7d22\uff0c\u4ed6\u5b83\u4eec\u5728\u4e00\u4e2a\u5e73\u9762\u4e0a\uff0cA1\u3001A2\u3001A3\u3001A4\u3001A5\u662f\u95f4\u9694\u5747\u5300\u5730\u56fa\u5b9a\u89e3\u7b54\uff1a\u89e3\uff1a\u2235A1B1\uff0cA2B2\uff0c\u2026\u3001A5B5\u662f\u659c\u62c9\u6865\u4e0a5\u6761\u4e92\u76f8\u5e73\u884c\u7684\u94a2\u7d22\uff0c\u5e76\u4e14B1\uff0cB2\uff0cB3\uff0cB4\uff0cB5\uff0e\u88ab\u5747\u5300\u5730\u56fa\u5b9a\u5728\u6865\u4e0a\uff0e\u2234B1B2+B2B2=B3B4+B4B5\uff0cA3B3\u662f\u68af\u5f62A1B1B5B5\u7684\u4e2d\u4f4d\u7ebf\uff0c
A3B3=12
\uff08A1B1+A5B5\uff09=1/2\uff0880+20\uff09=50\uff08cm\uff09\uff0e
\u540c\u7406\uff0cA2B2\uff0c=1/2 \uff08A1B1+A3B3\uff09=1/2 \uff0880+50\uff09=65\uff08cm\uff09\uff0e
\u6613\u77e5A3B3\u662f\u68af\u5f62A5A1B1B5\u7684\u4e2d\u4f4d\u7ebf
\u6545A3B3=(A5B5+A1B1)/2=30
A2B2\u662f\u68af\u5f62A1B1B3A3\u7684\u4e2d\u4f4d\u7ebf
\u6545A2B2=(A3B3=A1B1)/2=39
\u540c\u7406A4B4=(A5B5+A3B3)/2=21
绛旓細鏁板垪涓烘椤规暟鍒楋紝an+a(n-1)>0锛屽洜姝ゅ彧鏈塧n-a(n-1)-2=0 an-a(n-1)=2锛屼负瀹氬笺傛暟鍒梴an}鏄互3涓洪椤癸紝2涓哄叕宸殑绛夊樊鏁板垪銆俛n=3+2(n-1)=2n+1 鏁板垪{an}鐨勯氶」鍏紡涓篴n=2n+1銆3.n=1鏃锛宎1b1=2²脳(2脳1-1)+2=6 b1=6/a1=6/3=2 n鈮2鏃讹紝a1b1+a2b2+...+...
绛旓細3)锛屾娊鍙栫殑6浜轰腑锛岀敺800/1200X6=4锛屽コ400/1200X6=2銆傝4鐢2濂冲垎鍒负:a1锛宎2锛宎3锛宎4锛沚1锛宐2锛屼粠6浜轰腑鎶2浜虹殑缁撴灉鏈:a1a2锛宎1a3锛宎1a4锛宎1b1锛宎1b2锛沘2a3锛宎2a4锛宎2b1锛宎2b2锛沘3a4锛宎3b1锛宎3b2锛沘4b1锛宎4b2锛沚1b2鍏15绉嶇粨鏋滐紝鍏朵腑鎭版湁1涓コ鐨勬湁8绉嶏紝鈭磒=8/15 ...
绛旓細a2009=2^2008 娉細 涓嶇煡閬撲綘瀛︽病瀛︾瓑姣旀暟鍒楋紝濡傛灉娌″鐨勮瘽锛岃嚜宸变篃鍙互鏍规嵁 2*A(n)B(n)=A(n+1)B(n+1)鎺ㄥ鍑烘潵銆侫(2009)B(2009)/A(2008)B(2008)=2 A(2008)B(2008)/A(2007)B(2007)=2 A(2007)B(2007)/A(2006)B(2006)=2 ..A2B2/A1B1=2 鎵鏈夊紡瀛愮浉涔橈紝寰楀埌A(2009)B(...
绛旓細璁惧悜閲 a=(a1锛宎2锛a3)锛宐=(b1锛b2锛宐3)锛屽垯 a*b=a1b1+a2b2+a3b3锛寍a|=鈭(a1^2+a2^2+a3^2)锛寍b|=鈭(b1^2+b2^2+b3^2)锛岀敱 a*b=|a|*|b|*cos銆坅锛宐銆夆墹 |a|*|b| 鍗冲緱 鈭(a1^2+a2^2+a3^2)*鈭(b1^2+b2^2+b3^2)鈮 a1b1+a2b2+a3b3 銆
绛旓細渚濋鎰, a,b 搴旇鏄悓缁村垪鍚戦噺 a=(a1,...,an)^T, b=(b1,...,bn)^T ab^T= a1b1 a1b2 ... a1bn a2b1 a2b2 ... a2bn ...anb1 anb2 ... anbn 鎵浠 ab ^T鐨勫瑙掑厓涔嬪拰 tr(ab^T) = a1b1+a2b2+...+anbn = a^Tb ...
绛旓細鍏堝亣璁句綘鐨勮姹傛槸锛氬湪A鍒楃殑A1鍗曞厓鏍艰嚦A6鍗曞厓鏍间腑鐨勬暟鍊煎垎鍒槸锛欰1锛孉2锛孉3锛孊1锛孊2锛孊3.鍦ㄦ帓搴忓悗鐨勭粨鏋滄纭簲涓猴細A1锛孊1锛孉2锛孊2锛A3锛孊3锛屼緷姝ょ被鎺ㄣ傚姙娉曪細1锛 鍦˙鍒楃殑B1鍗曞厓鏍艰緭鍏ュ叕寮忥細=RIGHT(A1,1)锛岀劧鍚庝笅鎷夊～鍏匓2鑷矪6鍗曞厓鏍笺2锛 鎸塀鍒楄繘琛屾帓搴忓嵆鍙疄鐜般傛敞鎰忥細鍏紡鍙傜敤浜庢暟瀛椾负0...
绛旓細鈭13=60掳锛屸埖鈭4=鈭12=60掳锛屸埓A1B1鈭A2B2鈭3B3锛孊1A2鈭2A3锛屸埓鈭1=鈭6=鈭7=30掳锛屸垹5=鈭8=90掳锛屸埓A2B2=2B1A2锛孊3A3=2B2A3锛屸埓A3B3=4B1A2=4锛孉4B4=8B1A2=8锛孉5B5=16B1A2=16锛屸︹埓鈻矨nBnAn+1鐨勮竟闀夸负 2n-1锛庘埓锛屸柍A2012B2012A2013鐨勮竟闀夸负22012-1=22011锛庢晠绛旀涓猴細...
绛旓細銆愬垎鏋愩濡傚浘锛鈭碘柍A1B1A2鏄瓑杈逛笁瑙掑舰锛屸埓A1B1=A2B1锛鈭3=鈭4=鈭12=60掳銆傗埓鈭2=120掳銆傗埖鈭燤ON=30掳锛屸埓鈭1=180掳锛120掳锛30掳=30掳銆傚張鈭碘垹3=60掳锛屸埓鈭5=180掳锛60掳锛30掳=90掳銆傗埖鈭燤ON=鈭1=30掳锛屸埓OA1=A1B1=1銆傗埓A2B1=1銆傗埖鈻A2B2A3銆佲柍A3B3A4鏄瓑杈逛笁瑙掑舰锛屸埓鈭...
绛旓細璁扮煩闃礨=(a1, a2,a3)^T Y=(b1, b2,b3)^T 鏄剧劧A=XY^T 鐢变簬R(X)=1锛堝洜涓篴1涓嶄负0锛屽垯X涓嶄负闆跺悜閲忥級涓擱(Y)=1锛堝洜涓篵1涓嶄负0锛屽垯Y涓嶄负闆跺悜閲忥級鍒橰(XY^T)<=R(X),R(Y)鍗砇(XY^T)<=1 浣哫Y^T鏄剧劧涓嶆槸闆剁煩闃碉紙鍥犱负绗1琛岀1涓厓绱犱笉涓0锛夊垯R(XY^T)=1 鍗砇(A)=1 ...
绛旓細瑙ｏ細 1锛夊甫鍏B1锛孊2鍧愭爣鍙緱锛寉=1/4x+1/12.鏅 鎵撲簡鍗婂ぉ娌℃湁浜 2锛夌敱棰樺彲鐭 涓夎褰㈢殑搴曡竟 L 渚濇涓 2锛1-t锛,2t,2(1-t),...楂樹负 H=yn=1/4n+1/12 寰 闈㈢Н Sn= 锛1/4n+1/12锛夛紙1-t锛 n=1,3,5,7,9锛...2k+1 锛1/4n+1/12锛塼 n=2,4,6,8,...2k...
