For each of the ideal op-amp networks below, answer the following questions. For each network, which resistors, if any, do not influence the value of output voltage v_0? Based on your answer to (i), redraw a simplified, but equivalent, ideal op-amp network. Which op-amp configuration is represented by each network? Based on the configuration of each equivalent network drawn in (ii), write down the closed-loop voltage gain A_v = v_o/v_s by inspection.