1.设a,b都是非零向量,若 向量AC=a+b ,向量DB=a-b.(1)当a与b满足_____a__模等于b模______________时,a+b与a-b垂直.(2)当a与b满足_____a垂直b________________时,|a+b|=|a-b|.2.设 向量OA,向量OB 不共线,点M在直线...
1.设a,b都是非零向量,若 向量AC=a+b ,向量DB=a-b.(1)当a与b满足_____a__模等于b模______________时,a+b与a-b垂直.(2)当a与b满足_____a垂直b________________时,|a+b|=|a-b|.2.设 向量OA,向量OB 不共线,点M在直线...