MATHS...

2007-12-02 5:22 am
1What is the general terms?
a)1,4,9,16,25,., b)1/2,1/6,1/12,1/20,1/30,1/42,..,

2From the statement ,''each term is equal to the sum of the square of the term number and the term number'',a)what is the general term?b)waht is the sum of the first two terms?c)Guess which term has a value of 110.
更新1:

SORRY,,, 第2題係: From the statement ,''each term is equal to the sum of the square of the term number and the term number",a)what is the general term?b)waht is the sum of the first two terms?c)Guess which term has a value of 110.

回答 (3)

2007-12-02 5:55 am
✔ 最佳答案
1.
a) T(1)=1=1^2
T(2)=4=2^2
T(3)=9=3^3
T(4)=16=4^4
T(5)=25=5^5
therefore, the general term=T(n)= n^2

b) T(1)=1/2=1/(1+1^1)
T(2)=1/6=1/(2+2^2)
T(3)=1/12=1/(3+3^3)
T(4)=1/20=1/(4+4^4)
T(5)=1/30=1/(5+5^5)
T(6)=1/42=1/(6+6^6)
therefore, the general term=T(n)=1/(n+n^n)

2.
a)T(1)=1+1^1=2
T92)=2+2^2=6
T(3)=3+3^3=12
therefore, the general term=T(n)=n+n^n
b) sum of first two term =T(1)+T(2)
=2+6
=8
c) let the term be n
1/(n+n^n)=110
n(n+1)=110=10*11=10*(10+1)
therefore, the 10th term has a value of 110
2007-12-02 5:51 am
1a) n^2
b) 1/n(n+1)

2. 睇唔到d亂碼
''each term is equal to the sum of the square of the term number and the term number'',
2007-12-02 5:47 am
1)
a) general term = n^2
b) 1 / [n*(n+1)]

2) I cannot read your statement clearly, "... and the term number ''...", what is '&#?
參考: me


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