设{an}是等差数列,{bn}是各项都为正数的等比数列,且a1=b1=1,a3+b5=21,a5+b3=13,求{an},{bn}的通项公式.已知数列{an},那么“对任意n∈N,点pn(n,an)都在直线y=2x+1上”是“{an}为等差数列”的( )A.必要不充
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/12 12:34:48
![设{an}是等差数列,{bn}是各项都为正数的等比数列,且a1=b1=1,a3+b5=21,a5+b3=13,求{an},{bn}的通项公式.已知数列{an},那么“对任意n∈N,点pn(n,an)都在直线y=2x+1上”是“{an}为等差数列”的( )A.必要不充](/uploads/image/z/11439918-54-8.jpg?t=%E8%AE%BE%7Ban%7D%E6%98%AF%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%2C%7Bbn%7D%E6%98%AF%E5%90%84%E9%A1%B9%E9%83%BD%E4%B8%BA%E6%AD%A3%E6%95%B0%E7%9A%84%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97%2C%E4%B8%94a1%3Db1%3D1%2Ca3%2Bb5%3D21%2Ca5%2Bb3%3D13%2C%E6%B1%82%7Ban%7D%2C%7Bbn%7D%E7%9A%84%E9%80%9A%E9%A1%B9%E5%85%AC%E5%BC%8F.%E5%B7%B2%E7%9F%A5%E6%95%B0%E5%88%97%7Ban%7D%2C%E9%82%A3%E4%B9%88%E2%80%9C%E5%AF%B9%E4%BB%BB%E6%84%8Fn%E2%88%88N%2C%E7%82%B9pn%28n%2Can%29%E9%83%BD%E5%9C%A8%E7%9B%B4%E7%BA%BFy%3D2x%2B1%E4%B8%8A%E2%80%9D%E6%98%AF%E2%80%9C%7Ban%7D%E4%B8%BA%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%E2%80%9D%E7%9A%84%EF%BC%88+%EF%BC%89A.%E5%BF%85%E8%A6%81%E4%B8%8D%E5%85%85)
xTN@/ @bBU ɑwݴBRJZT
EA,ЖBBK䱓33eʣEw3{{//M絿*_>nM.p.[^?A0Xo,DdjFA34*a0Uo38~i
hyviz=RU8?ni6Z^V>QVёtB7A^*-mB)XU(M/˽7^s=[u^DH+9A