已知数列an满足a1=a,an=an+1+2.定义数bn,bn=1/an n为正数 若4﹤a﹤6,则已知数列an满足a1=a,an=an+1+2.定义数bn,bn=1/an n为正数若4﹤a﹤6,则数列bn最大项的项数为
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![已知数列an满足a1=a,an=an+1+2.定义数bn,bn=1/an n为正数 若4﹤a﹤6,则已知数列an满足a1=a,an=an+1+2.定义数bn,bn=1/an n为正数若4﹤a﹤6,则数列bn最大项的项数为](/uploads/image/z/2118122-26-2.jpg?t=%E5%B7%B2%E7%9F%A5%E6%95%B0%E5%88%97an%E6%BB%A1%E8%B6%B3a1%3Da%2Can%3Dan%2B1%2B2.%E5%AE%9A%E4%B9%89%E6%95%B0bn%2Cbn%3D1%2Fan+n%E4%B8%BA%E6%AD%A3%E6%95%B0+%E8%8B%A54%EF%B9%A4a%EF%B9%A46%2C%E5%88%99%E5%B7%B2%E7%9F%A5%E6%95%B0%E5%88%97an%E6%BB%A1%E8%B6%B3a1%3Da%2Can%3Dan%2B1%2B2.%E5%AE%9A%E4%B9%89%E6%95%B0bn%2Cbn%3D1%2Fan+n%E4%B8%BA%E6%AD%A3%E6%95%B0%E8%8B%A54%EF%B9%A4a%EF%B9%A46%2C%E5%88%99%E6%95%B0%E5%88%97bn%E6%9C%80%E5%A4%A7%E9%A1%B9%E7%9A%84%E9%A1%B9%E6%95%B0%E4%B8%BA)
已知数列an满足a1=a,an=an+1+2.定义数bn,bn=1/an n为正数 若4﹤a﹤6,则已知数列an满足a1=a,an=an+1+2.定义数bn,bn=1/an n为正数若4﹤a﹤6,则数列bn最大项的项数为
已知数列an满足a1=a,an=an+1+2.定义数bn,bn=1/an n为正数 若4﹤a﹤6,则
已知数列an满足a1=a,an=an+1+2.定义数bn,bn=1/an n为正数
若4﹤a﹤6,则数列bn最大项的项数为
已知数列an满足a1=a,an=an+1+2.定义数bn,bn=1/an n为正数 若4﹤a﹤6,则已知数列an满足a1=a,an=an+1+2.定义数bn,bn=1/an n为正数若4﹤a﹤6,则数列bn最大项的项数为
∵数列{an}满足a1=a,an=a(n+1)+2,
∴ a(n+1)-an=-2
∴数列{an}是首项为a1=a,公差为d=-2的等差数列,
∴an=a1+(n-1)d=-2n+2+a是递减数列,
∵4<a<6,-2n+2+4
an为等差数列,an=a-2n+2,bn=1/(a-2n+2),b1,b2,b3>0且递增,所以数列bn最大项的项数为3.
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