化简得a²+2ab+b²+2a²+ab-2ab-b²-3a²
=a²+2a²-3a²+b²-b²+2ab-2ab+ab
=ab
求值得ab=（2+√￣3）乘以（√￣3 -2）
=2√￣3-4+3- 2√￣3
=-1