Tìm x biết (1/2+1/3+...+1/2012+1/2013).x = 2012/1+2011/2+2010/3+...+2/2011+1/2012
tìm X biết : ( 1 / 2 + 1/3 + ........+ 1 /2012 + 1/2013 ) . x = 2012/1 + 2011/2 + 2010 /3 + .....+2/2011+1/2012
tìm x, biết: (1/2+1/3+..+1/2013).x=2012/1+2011/2+...+1/2012
tìm x biết:
(1/2+1/3+...+1/2012+1/2013).x = 2012/1+2111/2+2010/3+...+2/2011+1/2012
tìm x,biet(1/2+1/3+.............+1/2012+1/2013).x=2012/1+2011/2+2010/3+......+2/2011+1/2012
tìm x (1/2+1/3+...+1/2013) *x= 2012 +2011/2+2010/3+...+2/2011+1/2012
Tìm x biết:
(1 + 1/2 + 1/3 +...+ 1/2013) . x + 2013= 2014/1+2015/2+... + 4025/2012 + 4026/2013
X+1/2014+x+2/2013=x+3/2012+x+4/2011
tìm x biết :(\(\frac{1}{2}+\frac{1}{3}+...+\frac{1}{2014}.x=\frac{2013}{1}+\frac{2012}{2}+....+\frac{2}{2012}+\frac{1}{2013}\)
