求数列通项公式方法(1).公式法(定义法)根据等差数列、等比数列的定义求通项1..数列满足=8,(),求数列的通项公式;2.设数列满足且,求的通项公式3.已知数列满足,求数列的通项公式。4.已知数列满足(),求数列的通项公式;5.已知数列满足且(),求数列的通项公式;6.已知数列满足且(),求数列的通项公式;7.数列已知数列满足则数列的通项公式=(2)累加法累加法适用于:若,则两边分别相加得例:1.已知数列满足,求数列的通项公式。2.已知数列满足,求数列的通项公式。3.已知数列满足,求数列的通项公式。4.设数列满足,,求数列的通项公式(3)累乘法适用于:若,则两边分别相乘得,例:1.已知数列满足,求数列的通项公式。2.已知数列满足,,求。3.已知,EMBEDEquation.3,求。(4)待定系数法适用于例:1.已知数列中,,求数列的通项公式2.(重庆,文,14)在数列中,若,则该数列的通项EMBEDEquation.DSMT4_______________3.(福建.理22.本小题满分14分)已知数列满足求数列的通项公式;(5)递推公式为(其中p,q均为常数)。先把原递推公式转化为其中s,t满足1.已知数列满足,求数列的通项公式。2.已知数列满足(I)证明:数列是等比数列;(II)求数列的通项公式;3.已知数列中,,,,求(6)递推公式中既有
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:把已知关系通过转化为数列或的递推关系,然后采用相应的方法求解。1.(北京卷)数列{an}的前n项和为Sn,且a1=1,,n=1,2,3,……,求a2,a3,a4的值及数列{an}的通项公式.2.(山东卷)已知数列的首项前项和为,且,证明数列是等比数列.3.已知数列中,前和①求证:数列是等差数列②求数列的通项公式4.已知数列的各项均为正数,且前n项和满足,且成等比数列,求数列的通项公式。_1234567890.unknown_1234567891.unknown_1234567892.unknown_1234567893.unknown_1234567894.unknown_1234567895.unknown_1234567896.unknown_1234567897.unknown_1234567898.unknown_1234567899.unknown_1234567900.unknown_1234567901.unknown_1234567902.unknown_1234567903.unknown_1234567904.unknown_1234567905.unknown_1234567906.unknown_1234567907.unknown_1234567908.unknown_1234567909.unknown_1234567910.unknown_1234567911.unknown_1234567912.unknown_1234567913.unknown_1234567914.unknown_1234567915.unknown_1234567916.unknown_1234567917.unknown_1234567918.unknown_1234567919.unknown_1234567920.unknown_1234567921.unknown_1234567922.unknown_1234567923.unknown_1234567924.unknown_1234567925.unknown_1234567926.unknown_1234567927.unknown_1234567928.unknown_1234567929.unknown_1234567930.unknown_1234567931.unknown_1234567932.unknown_1234567933.unknown_1234567934.unknown_1234567935.unknown_1234567936.unknown_1234567937.unknown_1234567938.unknown_1234567939.unknown_1234567940.unknown_1234567941.unknown_1234567942.unknown_1234567943.unknown_1234567944.unknown_1234567945.unknown_1234567946.unknown_1234567947.unknown_1234567948.unknown_1234567949.unknown_1234567950.unknown_1234567951.unknown_1234567953.unknown_1234567954.unknown_1234567955.unknown_1234567956.unknown_1234567957.unknown_1234567958.unknown_1234567959.unknown_1234567960.unknown_1234567961.unknown_1234567962.unknown_1234567963.unknown_1234567964.unknown_1234567965.unknown_1234567966.unknown_1234567967.unknown_1234567968.unknown_1234567969.unknown_1234567970.unknown_1234567971.unknown_1234567972.unknown_1234567973.unknown_1234567974.unknown_1234567975.unknown_1234567976.unknown_1234567977.unknown_1234567978.unknown_1234567979.unknown_1234567980.unknown_1234567981.unknown_1234567982.unknown_1234567983.unknown_1234567984.unknown_1234567985.unknown_1234567986.unknown_1234567987.unknown_1234567988.unknown_1234567989.unknown_1234567990.unknown_1234567991.unknown_1234567992.unknown_1234567993.unknown_1234567994.unknown_1234567995.unknown_1234567996.unknown_1234567997.unknown_1234567998.unknown_1234567999.unknown