化简:(1)5a2-[a2+(5a2-2a)-2(a2-3a)];(2)-{-[-(-a2)-b2]}-[-(-b)2].-数学

题目简介

化简:(1)5a2-[a2+(5a2-2a)-2(a2-3a)];(2)-{-[-(-a2)-b2]}-[-(-b)2].-数学

题目详情

化简:
(1)5a2-[a2+(5 a2-2a)-2(a2-3a)];
(2)-{-[-(-a2)-b2]}-[-(-b)2].
题型:解答题难度:中档来源:不详

答案

(1)5a2-[a2+(5 a2-2a)-2(a2-3a)],
=5a2-a2-5a2+2a+2a2-6a,
=a2-4a;

(2)-{-[-(-a2)-b2]}-[-(-b)2],
=[-(-a2)-b2]-(-b2),
=a2-b2+b2,
=a2.

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