�eW(wng)Zo|eôӋ?
1.�eW(wng)e(һһ壬θ)
eW(wng)e=2+2L+2L+(L-1)
2.Zo|e(һһp)
we=L
e=(L+2ߡL)(+2)
Zo|e=we+e=L+(L+2ߡL)(+2)
һ ź
һ ֙C鿴