第2題
(a)

V/6 = (8-V)/2 + (12-V)/3
V=8

(b)

(Vc-8)/4 + (Vc-V) =8
(8-V)/2 + (Vc-V) = V/6
解聯立得 V=12

(c)

(8-Vc)/4 + (V-Vc)/3 = Vc/12
(8-V)/2 + (Vc-V)/3 = V/6
解聯立得 V=6