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计算:3a2-[a2+(5a2-2a)-2(a2-3a)].
人气:109 ℃ 时间:2019-11-09 04:18:08
解答
3a2-[a2+(5a2-2a)-2(a2-3a)]
=3a2-(a2+5a2-2a-2a2+6a),
=3a2-(4a2+4a),
=3a2-4a2-4a,
=-a2-4a.
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