等差数列10,5,0,-5.的公差是_____.

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等差数列10,5,0,-5.的公差是_____.

等差数列10,5,0,-5.的公差是_____.
等差数列10,5,0,-5.的公差是_____.

等差数列10,5,0,-5.的公差是_____.
等差数列10,5,0,-5.的公差是:-5