\(\frac{2}{2\times4}+\frac{2}{4\times6}+\frac{2}{6\times8}+\frac{2}{8\times10}\)
\(=\frac{2}{2}-\frac{2}{4}+\frac{2}{4}-\frac{2}{6}+\frac{2}{6}-\frac{2}{8}+\frac{2}{8}-\frac{2}{10}\)
\(=\frac{2}{2}-\frac{2}{10}\)
\(=1-\frac{1}{5}\)
\(=\frac{4}{5}\)
\(\frac{4}{2x4}+\frac{4}{4x6}+\frac{4}{6x8}+\frac{4}{8x10}+...+\frac{4}{16x18}+\frac{4}{18x20.}\)
Tìm y biết \(\left(\frac{1}{2x4}+\frac{1}{4x6}+\frac{1}{6x8}+\frac{1}{8x10}\right).y=\frac{1}{3}\)
\(\frac{2}{2x4}\)+ \(\frac{2}{4x6}\)+ \(\frac{2}{6x8}\)+ \(\frac{2}{8x10}\)+ \(\frac{2}{10x12}\)+ \(\frac{2}{12x14}\)
Ai giúp mình với ạ
Mình cảm ơn !!!
Tính:
\(\frac{1}{2x4}+\frac{1}{4x6}+\frac{1}{6x8}+..................+\frac{1}{96x98}+\frac{1}{98x100}\)
Nếu giải đúng có lời giải ,sẽ có 2 tick
tìm y:
(2/2x4 + 2/4x6 + 2/6x8 + 2/8x10) x y = 1/3
Tính:
\(\frac{1}{2x4}+\frac{1}{4x6}+\frac{1}{6x8}+...........+\frac{1}{96x98}+\frac{1}{98x100}\)
giải nhanh ,có lời giải cơ sở sẽ có tick
\(\frac{1}{2x4}\)+ \(\frac{1 }{4x6}\)+ \(\frac{1}{6x8}\) + \(\frac{1}{8x10}\)+ ........... + \(\frac{1}{98x100}\) = ?
A=\(\frac{1}{2x4}+\frac{1}{4x6}+\frac{1}{6x8}+......+\frac{1}{98x100}\)
\(\frac{4}{2x4}x\frac{4}{4x6}x\frac{4}{6x8}x.......x\frac{4}{16x18}x\frac{4}{18x20}\)
