(a-1/2)[(a+1/2b)²-(a-1/2b)²]﹙a²+1/2ab+b²﹚-2b﹙a⁴-1﹚化简,a=2,b=-1

问题描述:

(a-1/2)[(a+1/2b)²-(a-1/2b)²]﹙a²+1/2ab+b²﹚-2b﹙a⁴-1﹚
化简,a=2,b=-1