求代数式-2m²-7+m的最大值
人气：138 ℃ 时间：2020-01-25 05:24:24
解答
原式=-2(m²-m/2)-7
=-2(m²-m/2+1/16-1/16)-7
=-2(m²-m/2+1/16)+1/8-7
=-2(m-1/4)²-55/8
所以最大值是-55/8
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