Problem solved, but i do not understand why does it matter, becouse
c == dbRead.query(CalcDBHelper.TABLE_VARIABLES, null, null, null, null, null, null);
Solution, set adapter like this:
spinnerX.setAdapter(new SpinnerAd(this, R.layout.formula_variable_item, ActMain.dbRead.query(CalcDBHelper.TABLE_VARIABLES, null, null, null, null, null, null), from, to));
spinnerY.setAdapter(new SpinnerAd(this, R.layout.formula_variable_item, ActMain.dbRead.query(CalcDBHelper.TABLE_VARIABLES, null, null, null, null, null, null), from, to));
spinnerZ.setAdapter(new SpinnerAd(this, R.layout.formula_variable_item, ActMain.dbRead.query(CalcDBHelper.TABLE_VARIABLES, null, null, null, null, null, null), from, to));