等差数列通项公式-2n+7=an求首项和公差

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等差数列通项公式-2n+7=an求首项和公差等差数列通项公式-2n+7=an求首项和公差等差数列通项公式-2n+7=an求首项和公差a1=-2*1+7=5a(n+1)-an=-2*(n+1)+7-(-

等差数列通项公式-2n+7=an求首项和公差
等差数列通项公式-2n+7=an求首项和公差

等差数列通项公式-2n+7=an求首项和公差
a1=-2*1+7=5
a(n+1)-an=-2*(n+1)+7-(-2n+7)=-2