‘·平面向量，，是第一次进入中学数学教材初学这评析实数斑、b满足a·b－0，则必有a－0或b部分内容时，同学们解题中常常会出现这样或那样的＝0但对向量｝、了满足｝·了＝0，却不能推出｝＝i锗误、有的锗误还不易梁觉现例析解间量题宁应注意＿了7。、a～ ’··Plane vector, is the first time to enter the mathematics textbooks for middle schools. This commentary on real numbers, b satisfies a b-0, there must be a-0 or b part of the content, the students often appear in the problem solving or If that = 0, but the vector }, satisfies} y = 0, but can not be introduced } = i error, and some of the fallacy is still not easy to think of the amount of analysis between the current problem should pay attention to the _7. a