已知平面直角坐标系中,点O为原点,A(-3,-4)B(5,-12)(1)求向量AB的坐标及Abs(向量AB)(2)若向量OC=OA+OB,OD=OA-OB,求OC,OD的坐标(3)求OA×OB(省略了向量XX)
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![已知平面直角坐标系中,点O为原点,A(-3,-4)B(5,-12)(1)求向量AB的坐标及Abs(向量AB)(2)若向量OC=OA+OB,OD=OA-OB,求OC,OD的坐标(3)求OA×OB(省略了向量XX)](/uploads/image/z/2751733-37-3.jpg?t=%E5%B7%B2%E7%9F%A5%E5%B9%B3%E9%9D%A2%E7%9B%B4%E8%A7%92%E5%9D%90%E6%A0%87%E7%B3%BB%E4%B8%AD%2C%E7%82%B9O%E4%B8%BA%E5%8E%9F%E7%82%B9%2CA%EF%BC%88-3%2C-4%EF%BC%89B%EF%BC%885%2C-12%EF%BC%89%EF%BC%881%EF%BC%89%E6%B1%82%E5%90%91%E9%87%8FAB%E7%9A%84%E5%9D%90%E6%A0%87%E5%8F%8AAbs%EF%BC%88%E5%90%91%E9%87%8FAB%EF%BC%89%EF%BC%882%EF%BC%89%E8%8B%A5%E5%90%91%E9%87%8FOC%EF%BC%9DOA%EF%BC%8BOB%2COD%3DOA-OB%2C%E6%B1%82OC%2COD%E7%9A%84%E5%9D%90%E6%A0%87%EF%BC%883%EF%BC%89%E6%B1%82OA%C3%97OB%28%E7%9C%81%E7%95%A5%E4%BA%86%E5%90%91%E9%87%8FXX%29)
已知平面直角坐标系中,点O为原点,A(-3,-4)B(5,-12)(1)求向量AB的坐标及Abs(向量AB)(2)若向量OC=OA+OB,OD=OA-OB,求OC,OD的坐标(3)求OA×OB(省略了向量XX)
已知平面直角坐标系中,点O为原点,A(-3,-4)B(5,-12)
(1)求向量AB的坐标及Abs(向量AB)
(2)若向量OC=OA+OB,OD=OA-OB,求OC,OD的坐标
(3)求OA×OB
(省略了向量XX)
已知平面直角坐标系中,点O为原点,A(-3,-4)B(5,-12)(1)求向量AB的坐标及Abs(向量AB)(2)若向量OC=OA+OB,OD=OA-OB,求OC,OD的坐标(3)求OA×OB(省略了向量XX)
1、AB向量只要用点B的坐标减去点A的坐标,即AB=(8,-8);|AB|=√(x²+y²)=8√2;
2、还是利用坐标.OA=(-3,-4),OB=(5,-12),则OC=(2,-16),OD=(-8,8);
3、OA*OB=x1x2+y1y2=(-3)×5+(-4)×(-12)=33.
1、AB=(5+3,-12+4)=(8,-8)
2、OC=(2,-16),OD=(-8,8)
3、OA*OB=-15+48=33