等差数列-17,-15,-13,-11,.的m项和最小,则m=?

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等差数列-17,-15,-13,-11,.的m项和最小,则m=?等差数列-17,-15,-13,-11,.的m项和最小,则m=?等差数列-17,-15,-13,-11,.的m项和最小,则m=?an=2

等差数列-17,-15,-13,-11,.的m项和最小,则m=?
等差数列-17,-15,-13,-11,.的m项和最小,则m=?

等差数列-17,-15,-13,-11,.的m项和最小,则m=?
an=2n-19
设前m项和最小,则有am0
解得8.5

-17，-15,-13,-11,-9,-7,-5,-3,-1，、、、第九项是相加和最小，所以m=9

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