compute and pick values from multiple excel into a master excel

dear all,
ive various excel, with multiple tabs.
i would like to compute a value and put the value in master excel.

can share some lights on how do you this.

many thanks

You are going to have to give

You are going to have to give us more to go on.
I think what you are trying to do isn't difficult but I can't be sure.

My guess is that English isn't your first language have you tried Google translate?