Drugs used in chemotherapy, such as capecitabine and oxaliplatin, use different ways to stop tumor cells from dividing so they stop growing or die. Giving capecitabine and oxaliplatin before surgery may shrink the tumor so that it can be removed. Giving capecitabine and oxaliplatin after surgery may kill any remaining tumor cells. This phase II trial is studying how well capecitabine and oxaliplatin work when given before and after surgery in treating patients with resectable liver metastases that is secondary to colorectal cancer