先化简,再求值：（3a的平方+6a-1）+（2-5a+a的平方）-（1-a-4a的平方）,其中a=1/3 怎么算?
人气：175 ℃ 时间：2019-08-18 13:19:21
解答
（3a的平方+6a-1）+（2-5a+a的平方）-（1-a-4a的平方）
=3a²+6a-1+2-5a+a²-1+a+4a²
=8a²+2a
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