你的k+2、k+1是下标吧
证明:
ak+2=ak*q²
ak+1=ak*q
ak+(ak+1)=ak+ak*q=ak(1+q)=1/2ak
ak+2=ak*q²=1/4ak
∵ak+(ak+1)=2(ak+2)
∴ak,ak+2,ak+1成等差数列
你的k+2、k+1是下标吧
证明:
ak+2=ak*q²
ak+1=ak*q
ak+(ak+1)=ak+ak*q=ak(1+q)=1/2ak
ak+2=ak*q²=1/4ak
∵ak+(ak+1)=2(ak+2)
∴ak,ak+2,ak+1成等差数列