P(A/B)=0.4乘以0.3=0.12
P(A+B)=0.4+0.3=0.7
P(非AB)=(1-0.4)乘以0.3=0.18
P(非A非B)=(1-0.4)乘以(1-0.3)=0.42
P(非A+B)=1-0.4+0.3=0.9