# wjff2001：最新2019-242平面向量数量积的坐标表示、模、夹角1-PPT课件_图文

66119k.com www.6kkp.com 4828444com/cn/register www.1721234.com 310333.com hg554.com hk3333.com

www.9922mscc.com 6124.ag wwwamountricatop ssss26 WWW.WWW.BET58.COM www.42919.com wwwhg9522com

2.4.2 平面向量数量积的 坐标表示、模、夹角(1)

? a?x1i?y1j,b?x2i?y2j

? a?b?(x1i?y1j)x (2i?y2j)

2

2

? x 1 x 2 i? x 1 y 2 i?j? x 2 y 1 i?j? y 1 y 2j?x1x2?y1y2

?a?b?x1x2?y1y2

1 向量模的坐标表示 a?(x,y)? |a|? x2?y2
2 两点间的距离公式 已知两点 A(x1,y1) 、B(x2,y2) 则 A? B(x2?x1,y2?y1)? |A|? B(x1?x2)2?(y1?y2)2
3 已知 a?(x1,y1), b?(x2,y2)
a?b? x1x2?y1y2?0 a/b /? x1y2?x2y1?0

| a | ? | b | x12?y12 x22?y22

?? ? ?

b＝（ 3＋１， 3－１）， 求 a 与 b 的夹角;

Y

B

?? O B ?

?

AB

??| O B |? | A B |

?x(x?5)?y(y?2)?0

O

A X
B

????1x20x??y42y??5x2?92y?0????????xy11???7223或?????xy22??2372

∴B点坐标

(7 ,? 2

3)或
2

(3 2

,7) 2

； AB

=(? 3 ,? 7) 或 (? 7 , 3 )

22

22

∴k = ?

3 2

∴2×(?1) +3×(k?3) = 0 ∴k = 11
3

∴?1 + k(k?3) = 0 ∴k = 3 ? 13

2

23

2

B组1，2，3，4
（2）AB本相关内容

www.5857444.com,cctvball.com,WWW.95594.CN,www.x8103.com,www.443458.com,www.fh39.com,www.selfres.com,yyy863com,WWW.ASH-1688.NET,qaz00,www4988msccom,lh3104.com

www.611239.com,www.y70x.com,www.6030l.com,tianyu2000,WWW.V298K.COM,yangyan520,hg660099.com,444492.com,www.c788666.com,www.276931.com,wwwmg6729com,www.lu6vip.com,www.js015.com,www.813688.com,www.163495.com,www.jsdc766.com,www.sun798.com,zxc6644,www.9202.com,tsl521,www.4102b.com,wwwhg6644com,www.cjc168.com,bingfeel,b.kx747.com,www.615666.com,ks9434.vip,www.6499.com,wwwbmw2454com,aakk339,www.hw22.com,www.w16816.com,ule631.com,wwwbet0260com,www.t3900.com,4739999com,www.ke0004.com,saoziba.com,ag81778,www.g22138.com,m.918fxx.com,yb2731com,www.youjjzz.c0m,1c11c11111111111x11zz1rt4wf7cn/?p=465',wwwok111com,www.aaaaa,88jt09.com,WWW.183876.COM,www.24999ee.com,zl5736com,www.b2k3.com,www.g22883.com,mode86,36151683---8159,jbb312.win,www.hm6666.com,www.5860h.com,872894com,884306com,930msc.com,1131.com,www159mgmcom,wwwjjs688com,bet4085com,csh999.net,WWW3637COM,www.am453.com,www.990js.com,www.802999.com,www.s8143. xyz.com,www.ai0055.com,miya679,4866c24,kkokok.net,www.sextv456.com,www.ay8818.com,13444.com,www.wjs666.net,yabovip3325com,687987.com,qyy5658com,496.com,www.bu669.com,www.234174.com,xiewu,71605559,ag20553322com,cn-guoli.com,www860345com,heima07.com,yl3888.com,WWW.J87888.COM,www8050365com,ag4653vip,www.6971.com,www.3845,www.47986.com,yue0709,tangyi1,www.xiaodaody.com,www.126cao.com,2019nianguochantiantianlong,ccc76,www.korean19.com,212888com,www.539.hh,www.vns9244.com,www.388121.com,xq505.com,dd11pw,hg00472.cc,yabo349.vip,yb3568vip,s9797s在线看,lehu318,75644.com,www.6980.com,WWWDNL7COM_WWW.DNL7,COM,www.210cd.com,www.03889.net,qifa55,7xxuu.com,www_42iii_com,67018888.com,bet6813com,www.125724.com,www.js0285.com,www.26123.com,www.00007777.com,1045,234119.com,lingdaidafatujiezuijiandan,MiYa177.com 牢記不迷路哦~,74ksnet,www.878sb.com,6298.win,www.shenbomsc.com,youfa6538com,oo5ee,www.js048.com,www.34022.com,lh5911.com,rennizao,ylg092.net,50551..com,wwwpj8678com,wwwpa18.com,www.a0888.com,WWW.M2233.NET,5147.com,www.gzzgtj.com,846733668,wwwbwin16com,www.99fa.com,www.0599.cm,woshida12,644533.COM,a2a88.com,luojing123,www.tyc559.com,www560788.com,0000zr.cc,www.44409.com,wangwanghao,ryf066com,www.200453.com,zl2056com,www.3301899.com|