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They are the bottom end of a potential divider.
R1, R2, R3, R4 are the top and R18 the bottom in one leg,
R5, R6, R7, R8 are the top and R17 the bottom in the other leg.
The circuit dimensioning makes no sense. The pull-up resistor biases LM358 outside its common mode range of 0 to 3.5 V.