(a-1/2)[(a+1/2b)²-(a-1/2b)²]﹙a²+1/2ab+b²﹚-2b﹙a⁴-1﹚化简,a=2,b=-1
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![(a-1/2)[(a+1/2b)²-(a-1/2b)²]﹙a²+1/2ab+b²﹚-2b﹙a⁴-1﹚化简,a=2,b=-1](/uploads/image/z/1024731-27-1.jpg?t=%28a-1%2F2%29%5B%28a%2B1%2F2b%29%26%23178%3B-%28a-1%2F2b%29%26%23178%3B%5D%EF%B9%99a%26%23178%3B%2B1%2F2ab%2Bb%26%23178%3B%EF%B9%9A-2b%EF%B9%99a%26%238308%3B-1%EF%B9%9A%E5%8C%96%E7%AE%80%EF%BC%8Ca%3D2%EF%BC%8Cb%3D-1)
(a-1/2)[(a+1/2b)²-(a-1/2b)²]﹙a²+1/2ab+b²﹚-2b﹙a⁴-1﹚化简,a=2,b=-1
(a-1/2)[(a+1/2b)²-(a-1/2b)²]﹙a²+1/2ab+b²﹚-2b﹙a⁴-1﹚
化简,a=2,b=-1
(a-1/2)[(a+1/2b)²-(a-1/2b)²]﹙a²+1/2ab+b²﹚-2b﹙a⁴-1﹚化简,a=2,b=-1
(a-1/2)[(a+1/2b)²-(a-1/2b)²]﹙a²+1/2ab+b²﹚-2b﹙a⁴-1﹚
=(a-1/2)*2ab﹙a²+1/2ab+b²﹚-2b﹙a⁴-1﹚
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