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2(3a-1)-3(2-5a+3a^2)其中a=-3/1 先化简 再求值
人气:197 ℃ 时间:2020-03-26 10:49:49
解答
2(3a-1)-3(2-5a+3a^2)
=6a-2-6+15a-9a²
=-9a²+21a-8
=-1-7-8
=-16
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