(a-12)(2a+1)(a2+14)-2(a+1)2(a-1)2-数学

题目简介

(a-12)(2a+1)(a2+14)-2(a+1)2(a-1)2-数学

题目详情

(a-
1
2
)(2a+1)(a2+
1
4
)-2(a+1)2(a-1)2
题型:解答题难度:中档来源:不详

答案

(a-class="stub"1
2
)(2a+1)(a2+class="stub"1
4
)-2(a+1)2(a-1)2,
=2(a-class="stub"1
2
)(a+class="stub"1
2
)(a2+class="stub"1
4
)-2[(a+1)(a-1)]2,
=2(a2-class="stub"1
4
)(a2+class="stub"1
4
)-2(a2-1)2,
=2a4-class="stub"1
8
-2a4+4a2-2,
=4a2-2class="stub"1
8

故答案为:4a2-2class="stub"1
8

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