求答案与解题过程·
﹙2a+1﹚﹙a-3﹚=2a²-6a+a-3=2a²-5a-3﹙2a+7﹚﹙a-6﹚=2a²-12a+7a-42=2a²-5a-42上式-下式得:-3-﹙-42﹚=-3+42=39>0即﹙2a+1﹚﹙a-3﹚-﹙2a+7﹚﹙a-6﹚=39>0∴﹙2a+1﹚﹙a-3﹚>﹙2a+7﹚﹙a-6﹚