In Problems $10\mathrm{.}68$ to $10\mathrm{.}73,$ design multiple $741$ op$-$amp circuits to develop the indicated output voltage, $v_{\text{o}\text{u}\text{t}},$ from the input voltages, $v_{\text{I}},v_2$ and $v_3$ using the minimum number of opamps. The input resistance to each input must be $100M$ or greater, and the inputs should not be directly coupled to one another. For each design, find $R_{in},R_{\text{o}\text{u}\text{t}},$ and the bandwidth. A minimum bandwidth of $50$ kHz must be achieved.

$10\mathrm{.}68v_{\text{o}\text{u}\text{t}}=3(v_l+v_2)$