1/(1*4)+1/(4*7)+1/(7*10)+1/(10*13)......+1/(2002*2005)+1/(2005*2008)
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1/(1*4)+1/(4*7)+1/(7*10)+1/(10*13)......+1/(2002*2005)+1/(2005*2008)1/(1*4)+1/(4*7)+1/(7*10)+1/(10*1
1/(1*4)+1/(4*7)+1/(7*10)+1/(10*13)......+1/(2002*2005)+1/(2005*2008)
1/(1*4)+1/(4*7)+1/(7*10)+1/(10*13)......+1/(2002*2005)+1/(2005*2008)
1/(1*4)+1/(4*7)+1/(7*10)+1/(10*13)......+1/(2002*2005)+1/(2005*2008)
1/[n×(n+3)]=[(1/n)-(1/n+3)]×1/3.按着这个式子,每一个都可以拆开,中间项全消了,只剩下1和1/2008.所以结果就是(1-1/2008)×1/3,也就是669/2008.希望楼主满意~~~
1/(1*4)+1/(4*7)+1/(7*10)+1/(10*13)......前n项和的公式
Sn=n/(3n+1)
当3n+1=2008时,n=669
1/(1*4)+1/(4*7)+1/(7*10)+1/(10*13)......+1/(2002*2005)+1/(2005*2008)=669/2008
1,4,7,(),16 1,4,7,(),20 1,4,7,(),24
1,2,4,7,(),(),().
初一简便运算6(7+1)(7^2+1)(7^4+1)(7^8+1)+16*(7+1)*(7^2+1)*(7^4+1)*(7^8+1)+1
先化简,再求值:6(7+1)(7²+1)([7^4]1)([7^8]+1)+1
计算,1/(1*4)+1/(4*7)+1/(7*10)+1/(10*13).1/(97*100)
7X(7X+1)+4分1 二次方程
(4/5+1/4)÷7/3+7/10
(1又3/4+7/8-7/12)×(-1又1/7)
4分之3-(7分之1-4分之1)
1,2,4,7,11,( ),( ).
1/28×(4 +7)怎么算
1 3 4 7 11 ()规律
(7/20-5/36)*4-4/9 【1-(1/4+3/8)】/1/4
1、1、2、4、7、11、()、()
(1又3/4+7/8-7/12)*(1又1/7)是加!
1/1*4+1/4*7+1/7*10+1/10*13+1/13*16的简便计算方法(过程)
(7-1):(4-1)=(11-1):(x-1)怎么解
(1)1+1/2+1/3+1/4+1/5+1/6+1/7+1/14+1/28