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Tính A:
\(\frac{1}{2.9}+\frac{1}{9.7}+\frac{1}{7.19}+...+\frac{1}{252.509}\)
tính \(y=\frac{1}{2.9}+\frac{1}{9.7}+\frac{1}{7.19}+...+\frac{1}{252.509}\)
tính nhanh :
A = \(\frac{1}{2.9}+\frac{1}{9.7}+\frac{1}{7.19}+......+\frac{1}{252.509}\)
B = \(\frac{1}{10.9}+\frac{1}{18.13}+\frac{1}{26.17}+......+\frac{1}{802.405}\)
*Tính:
a) A = \(\frac{1}{2.9}+\frac{1}{9.7}+\frac{1}{7.19}+...+\frac{1}{252.509}\)
b) B = \(\frac{1}{10.9}+\frac{1}{18.13}+\frac{1}{26.17}+...+\frac{1}{802.405}\)
c) C = \(\frac{2}{4.7}-\frac{3}{5.9}+\frac{2}{7.10}-\frac{3}{9.13}+...+\frac{2}{301.304}-\frac{3}{401.405}\)
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Tính:
A=\(\frac{1}{2.9}+\frac{1}{9.7}+\frac{1}{7.19}+...+\frac{1}{252.509}\)
B=\(\frac{1}{10.9}+\frac{1}{18.13}+\frac{1}{26.17}+...+\frac{1}{802.405}\)
C=\(\frac{2}{4.7}-\frac{3}{5.9}+\frac{2}{7.10}-\frac{3}{9.13}+...+\frac{2}{301.304}-\frac{3}{401.405}\)
Giúp mik nhá mọi người. THANKS NHÌU............................................................
Tính A\(=\frac{1}{2.9}+\frac{1}{9.7}+\frac{1}{7.19}+........+\frac{1}{252.504}\)
Tính A=\(\frac{1}{2.9}+\frac{1}{9.7}+\frac{1}{7.19}+......+\frac{1}{252.504}\)
*Tính:
a) A = \(\frac{1}{2.9}+\frac{1}{9.7}+\frac{1}{7.19}+.....+\frac{1}{252.509}\)
b) B = \(\frac{1}{10.9}+\frac{1}{18.13}+\frac{1}{26.17}+.....+\frac{1}{802.405}\)
c) C = \(\frac{2}{4.7}-\frac{3}{5.9}+\frac{2}{7.10}-\frac{3}{9.13}+.....+\frac{2}{301.304}-\frac{3}{401.405}\)
giải giúp mình, mình đang gấp
chung minh A<1/10:A=1/2.9+1/9.7+..+1/252.509