P(肉)=(ep)/(1-ecosA)
a=5
b=4
c=3
aa/c=25/3
p=aa/c-c=bb/c=16/3
e=3/5
1/P(肉1)=(1-ecosA)/ep
1/P(肉2)=(1+ecosA)/ep
1/FA+1/FB=1/P(肉1)+1/P(肉2)=2/ep
P(肉)=(ep)/(1-ecosA)
a=5
b=4
c=3
aa/c=25/3
p=aa/c-c=bb/c=16/3
e=3/5
1/P(肉1)=(1-ecosA)/ep
1/P(肉2)=(1+ecosA)/ep
1/FA+1/FB=1/P(肉1)+1/P(肉2)=2/ep