56. How many op-amps are required to implement this equation? Vo = V1
(a) 2
(b) 3
(c) 4
(d) 1
57. Calculate the output voltage for this circuit when V1 = 2.5 V and V2 = 2.25 V.
(a) –5.25 V
(b) 2.5 V
(c) 2.25 V
(d) 5.25 V
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