12. 有一電路如右圖所示,V1 = 1.5 V,V2 = 2.5 V,V3 = 2 V, R1 = R2 = R3 = 3 kΩ,R4=1 kΩ,試求 Vo 為何?
(A) -6 V
(B) -3 V
(C) -2 V
(D) 0 V
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統計: A(7), B(4), C(31), D(0), E(0) #3234768
統計: A(7), B(4), C(31), D(0), E(0) #3234768