\(Tínhnhanh:\frac{1}{5}+\frac{1}{10}+\frac{1}{20}+\frac{1}{40}+....+\frac{1}{1280}\)
Tính nhanh: \(\frac{1}{5}+\frac{1}{10}+\frac{1}{20}+\frac{1}{40}+....+\frac{1}{1280}\)
\(\frac{1}{10}+\frac{1}{20}+\frac{1}{40}+...+\frac{1}{1280}=\frac{1}{x-2}\)
Hãy tính bằng cách hợp lí;\(\frac{1}{5}+\frac{1}{10}+\frac{1}{20}+\frac{1}{40}+......+\frac{1}{1280}\)
Ai đúng mị tick cho
\(\frac{1}{5}\)+ \(\frac{1}{10}\)+ \(\frac{1}{20}\)+ \(\frac{1}{40}\)+...+ \(\frac{1}{1280}\)+ \(\frac{1}{2560}\)
Trình bày cách làm hộ mình nhé ^_^
\(\frac{1}{5}+\frac{1}{10}+\frac{1}{20}+....+\frac{1}{1280}\) làm thế nào
Bài 1:
\(a,\left(x-\frac{1}{2}\right)\cdot\left(\frac{1}{2}+\frac{1}{6}+\frac{1}{12}+\frac{1}{20}+......+\frac{1}{90}\right)=\frac{1}{3}\)
\(b,\frac{1}{1\cdot6}+\frac{1}{6\cdot11}+.....+\frac{1}{96\cdot101}=\frac{1}{10\cdot x}\)
\(c,460+85\cdot4=\frac{x+175}{5}+30\)
\(d,\left(x-5\right)\cdot\left(10-9\frac{40}{41}\right):\left(1-\frac{81}{82}\right):\left(1-\frac{204}{205}\right)=2050\)
\(\frac{1}{5}+\frac{4}{10}+\frac{9}{15}+\frac{16}{20}+\frac{25}{25}+\frac{36}{30}+\frac{49}{35}+\frac{64}{40}+\frac{81}{45}\)=?
Tính nhanh \(\frac{1}{5}+\frac{4}{10}+\frac{9}{15}+\frac{16}{20}+\frac{36}{30}+\frac{64}{40}+\frac{81}{45}\)
