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https://www.physicsforums.com/attachment.php?attachmentid=32237&d=1297816285

I began to analyze it and I got to this:

OA2 is a non inverting amplifer

OA1 is a voltage follower

thus:

V1(1+ (R1/R2) is the input for R3 into the final op-amp OA3 which is an inverting op-amp. And V2 is the second input that goes through R4 into the op-amp OA3.

Could someone please verify my logic, and tell me whether this is a summarizing op-amp in the end with 2 inputs into the negative terminal, with feedback resistor R5?

Thanks!!