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(m-2)(m²+2m+4)-2m(m²-3),其中m=2
人气:481 ℃ 时间:2020-03-27 11:27:56
解答
答:
(m-2)(m²+2m+4)-2m(m²-3)
=m³+2m²+4m-2m²-4m-8-2m³+6m
=-m³+6m-8
=-2³+12-8
=-4
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