立体几何中有关数量计算和位置判断的问题可根据几何图形的结构特征进行处理,但在破解“位置定位问题、展叠面积问题、最值计算问题”时许多同学经常会因忽视立几可能存在的情况而致错,因此避免漏解一直是我们所需要克服的一个难点.而“换位思考”法可有效避免立几的漏解.下面就如何用“换位思考”法 The problem of quantity calculation and position judgment in solid geometry can be dealt with according to the structural features of geometry, but many students often neglect to stand a few problems when solving the problem of “positioning, stacking area, and maximum value calculation” May be the existence of the situation and wrong, so to avoid the leakage has always been a difficult problem we need to overcome. “Transposition thinking ” method can effectively avoid a few leaks. Here's how to use “empathy ”law