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electronic devices operational amplifiers
1. Calculate the output voltage if R1 = R2 = R3 = 100 , Rf = 1 k, and V1 = V2 = V3 = 50 mV.
(A): –0.5 V
(B): –1.5 V
(C): 0.5 V
(D): 1.5 V
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