（a+1/a+b)^2-(a-1/a+b)^2怎么解啊（a+1/a+b)^2-(a-1/a+b)^2咋么解啊!

x��)�{��#Q�P?Q;I3�HW#Q�~���dgNj募N�©��n�"E��"}��ï�P�;�;�6Z�T�0!��Q�ц��t��n�&T�Q��Q���~"�o��m�� ��$��A�c�$��g2d ̐�+�OY�b��';V=m]�tO�� ����{�]m%}�¶�& y�� Q�tu���F(��I"H�m����