Tính B:
B= 1/10.9 + 1/18.13 + 1/26.17 + ..... + 1/802.405
Tính B:
B=1/10.9 + 1/18.13 + 1/26.17 + ... + 1/802.405
. là dấu nhân nha
bài 1 : tính
\(B=\dfrac{1}{10.9}+\dfrac{1}{18.13}+\dfrac{1}{26.27}+...+\dfrac{1}{802.405}\)
\(D=\dfrac{1}{2}-\dfrac{1}{2^4}+\dfrac{1}{2^7}-\dfrac{1}{2^{10}}+...-\dfrac{1}{2^{58}}\)
mn giúp mk gấp nhé !!
Tính :
a)A=1/2.9 + 1/9.7 + 1/7.19 + ...+1/252.509
b)B=1/10.9 + 1/18.13 + 1/26.17 + ... + 1/802.405
c)C=2/4.7 - 3/5.9 +2/7.10 - 3/9.13+...+2/301.304 - 3/401.405
Tính
a) A= 1/2.9 + 1/9.7 + 1/7.19 +....+ 1/252.509
b) B= 1/10.9 + 1/18.13 + 1/26.17+.... + 1/802.405
Nhanh nhaaa iuuu
\(\frac{1}{10.9}+\frac{1}{18.13}+\frac{1}{26.17}+...+\frac{1}{802.405}\)
Tính
Tính tổng:\(\frac{1}{10.9}+\frac{1}{18.13}+\frac{1}{26.17}+...+\frac{1}{802.405}\)
tính nhanh :
A = \(\frac{1}{2.9}+\frac{1}{9.7}+\frac{1}{7.19}+......+\frac{1}{252.509}\)
B = \(\frac{1}{10.9}+\frac{1}{18.13}+\frac{1}{26.17}+......+\frac{1}{802.405}\)
B= 1/10.9 +1/18.13 +1/26.17 +...+1/802.405