Các câu hỏi tương tự
1, Tìm x
\(\frac{1}{5x7}+\frac{1}{7x9}+\frac{1}{9x11}+.....+\frac{1}{2009x2011}+\frac{1}{x}=\frac{1}{5}x0,5\)
tìm x biết: 1/5x7 + 1/7x9 + 1/9x11 +.........+ 1/2013x2015 + 1/x+2 = 202/2015
giúp mình với, gấp lắm
(1/1x3+1/3x5+1/5x7+1/7x9+1/9x11+1/11x13)xy=3/5
1/5x7 + 1/7x9 + 1/9x11 +………1/97x99
tim x biet;
[1/3x5+1/5x7+1/7x9+...1/9x11]nhan x =8/11. giup minh nhe cac ban dep trai dep gai nhe.
1/3x5+1/5x7+1/7x9+1/9x11+1/11x13
1/1x3+1/3x5+1/5x7+1/7x9=1/9x11
1/1x3+1/3x5+1/5x7+1/7x9+1/9x11 = ?
tìm y:(1/1x3+1/3x5+1/5x7+1/7x9+1/9x11)xy=2/3