I'm using superposition to solve this problem. I already know that for U1 the output is Ua1=-R/R. Unfortunately I'm not sure what is the output for U2 and U3.

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    \$\begingroup\$ You know that the negative feedback causes the output to adjust until the inverting input voltage is the same as the non-inverting input. Figure out the non-inverting input voltage first. Then figure out the currents going in and out of the inverting node. \$\endgroup\$ – Transistor Jan 1 at 21:35
  • \$\begingroup\$ A statement with a question mark is still a statement. \$\endgroup\$ – JRE Jan 1 at 21:37

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