Update multiple fields/columns in QGIS

I need to update fields in attribute table of a vector using QGIS. I use field calculator for each field, but i have too many fields (and too many vectors also) and i need to program the task. The code that i'm using for each first field is:

segALD00*(((xmin($geometry) - xmax($geometry))^2+(ymin($geometry) - ymax($geometry))^2)^0.5)*102.47/longkm

to the last field

segALD23*(((xmin($geometry) - xmax($geometry))^2+(ymin($geometry) - ymax($geometry))^2)^0.5)*102.47/longkm

Then another vector:

segETH00*(((xmin($geometry) - xmax($geometry))^2+(ymin($geometry) - ymax($geometry))^2)^0.5)*102.47/longkm

to the last field

segETH23*(((xmin($geometry) - xmax($geometry))^2+(ymin($geometry) - ymax($geometry))^2)^0.5)*102.47/longkm

How can i code this?