1、解: (1) P{只订购 A 的}=P{A(B∪C)}=P(A)-{P(AB)+P(AC)-P(ABC)}=0.45-0.1.-0.08+0.03=0.30. (2) P{只订购 A 及 B 的}=P{AB}-C}=P(AB)-P(ABC)=0.10-0.03=0.07 (3) P{只订购 A 的}=0.30
第一节 崩塌 6.1 Collapse 6.1.1 Types of collapse 6.1.2 Forming conditions of collapse 6.1.3 Accumulation and landforms of collapse 第二节 滑坡 6.2 Landslide 6.2.1 The shape of a landslide 6.2.2 Influence factors to a landslide 6.2.3 Types of a landslide 6.2.4 The development of a landslide 6.2.5 Prevention of a landslide