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化简求值:2(3a-1)-3(2-5a+3a2次方),其中a=-1/3
人气:477 ℃ 时间:2019-08-19 23:46:56
解答
2(3a-1)-3(2-5a+3a²)
=6a-2-6+15a-9a²
=21a-8-9a²
=21×(-1/3)-8-9×(-1/3)²
= -7-8-1
= -16
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