16.如圖所示，R1 = Rf = 47 kΩ、R2 = R3 = 10 kΩ，若V1 = 3V、V2 = 2V，則Vo為多少V？ 
(A)1
(B)-1
(C)2
(D)-2。 

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統計： A(1), B(25), C(2), D(1), E(0) #810169