新人教版教材必修3指出,几何概型中事件A的概率公式P(A)=构成事件A的区域长度(面积或体积)÷试验的全部结果所构成的区域长度(面积或体积).那么在运用此公式解题时,如何选用适当的测度(长度、面积、体 PEP 3 specifies that the probability formula for event A in the geometry profile P (A) = the length (area or volume) of the region that constitutes event A ÷ the region length (area or volume) that results from the overall result of the experiment. Then in the use of this formula to solve problems, how to choose the appropriate measure (length, area, body