5a(a^2+2a+1)-a(a-4)(5a-3),其中a=-2
人气：208 ℃ 时间：2020-06-22 09:08:26
解答
5a(a²+2a+1)-a(a-4)(5a-3)
=5a³+10a²+5a-a(5a²-23a+12)
=5a³+10a²+5a-5a³+23a²-12a
=25a²-2a
∵a=-2
∴原式=25×(-2)²-2×(-2)
=100+4
=104
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