数学新教科书高二下 (B)引入空间向量后 ,给传统的直线、平面及简单几何体注入了新的活力 ,为几何推理开辟了新的途径、新的思想方法 .改变了其常规的“作、证、解”,三步曲解法 ,引入向量后 ,一类是直接建立空间直角坐标系 ,设点的坐标 ,而后用向量的数量积公式、共线性质等知 After introducing the space vector, the new mathematics textbook Gao Bing (B) injected new vitality into traditional straight lines, planes, and simple geometry, opened up new ways and new ways of thinking for geometric reasoning, and changed its conventional method. “Proof, Solution”, a three-step solution method. After the introduction of vectors, one type is to directly establish the spatial rectangular coordinate system, set the coordinates of the point, and then use the quantity product formula and the collinearity property of the vector.