平面向量的基本定理及坐标表示一、目标与策略DDDDD•□□□□□□□□□□□□□□□□•□□□□□□□□□□□□□□□□□□•□□□□□□□□□□□□□□□□□□□□□□•□□□□□□□□□□□□□□□□□□DDDDD•□□□□□□□□□□□□□□□□□□□□□□•□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□DDDDD•□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□a□□□□HIIIIIIIIIII二、学习与应用annnnnnnnnnnnnmnnnnnnnnnDDDDDDDD□□□□□□□□□□□□□□□□□□□□a□□□□□□□□□□□□a□□□□□□□□□□□□□a+b=□□2DQDDQa+b丿+c=□□□□□□□□□□□a□□□□a□□□b□□□□□□□□□□□□□□□DDD2DDDDDmrJDDDDDDDDDDe,eDDDDDDDDDD12DDD.DDDDD-……D3DODD~e,eJffDDD12二_.DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDaD方o(x』y)=尢(x□y)□□九,九DD12,De,eDDDDDD12D1UM一~e,eDDDDDDDDDDDDDD12DDDDDDDDDDDDDDDTDTJDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDA(xDy)DDOA=(D._.…_.)DDDDDDDDDDDDDDDDDDDABDDDDDDDDDDDDDDA(x』yi)DB(X2Dy2)DDAB=(-.……D)0DDDDDDDDDDDDDDDDDDDDDOA=(xDy)0OB=(^□y)DDDDDOA+OB=(□)□-QB-OA=(.fl)DDDDDDDDDa=(xr尢a=(D)DDDDDDDDDDDDDDDDDDDDa=(x,y),b=(x,y)叮1122DDDDDDDDDDDDDDDe,eDDDDDDDD12DDDDDDDDDDDDDDDDDxe+ye—0□□□□□x—>>—►>□□□□□□□□□BQ□QP□□□□□□□□□□□□□□□□□□□□□DDDDDD1DQD2DDDDDDDAGBGODD1DDABCDDBD=DCDAE=2EC叮,DGDGEDDDDDDDABDACDDDDDDDAGDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD□2D□□A(—1,2),B(2,8)□□AC=1AB,DA=—1BA,□□33CDD□□□□□CD□□□□□□□□□□□□□□□□CD□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□1DDDA(—2,4),B(3,—1),C(—3,—4)□□CM二3CA,CN二2CB,□□MUN□MN□□□三、总结与测评□3D□□□□□□□□□a二(3,2),b二(一1,2),c二(4,1)□1QQ(a+kc)//(2b—a),□□□kD―>―>―>□2叮d二(x,y)□□(d—c)//(a+b)□Id—cI二1,□d□—>—>—>—>□□□□□—>—>—>—>—>—>—>□1叮叮叮叮叮叮叮k□□□□□□□□□□k□□□□2叮叮叮叮叮叮xDy□□□□□□□□□□□□□xDy□□□□□□□d□□□□□□□1D□□2DDDDDDDDDDDDDDnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDA(x,y),B(x,y),C(x,y),112233AB=(x2-xDy2-y)DAC=(x3-xDy3-y)DD(x—x)(y—y)—(x—x)(y—y)=0,DADBDCDDDDD22332332DDDDDDDDDDDDDDDDDDDDDnnnnnnnnnnnn000000080DDDDDDDDDDDIDD#cgcp0#254193DDDDDDDDDDDDDDDDDD80DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDIDD#254193口IDD#27833口0000000000000000000000000DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD50%-80%叮口DDDDDDDDDDDDDD50%DDD80%DOO000DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD
