For the circuit shown above, find the gain (vo / vi). Make simplifying assumptions about the OP-AMP such as v+= v- but you must state the conditions for which this is true.  Please as soon as possible！

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Operational Amplifier

An operational amplifier also called op amp is an integrated circuit or analog circuit that takes input as a differential voltage and produces output as a single-ended voltage. It is an IC that can amplify weak electric signals.An op amp has one output pin and two input pins. The basic role of an opamp is to amplify the voltage difference between the two input voltages. It is also used in filtering or to perform mathematical operations or in signal conditioning.