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Analyze the op amp （assuming ideal) circuit shown ...

Analyze the op amp (assuming ideal) circuit shown below, find the voltage gain Analyze the op amp （assuming ideal) circuit shown = . and input resistance= .

A、-7.5，20kΩ

B、-5，25kΩ

C、-6，15kΩ

D、-4.5，10kΩ

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