سلام اريد حل هذا العنصر ربي خليكم

[mouaffak]

http://im56.gulfup.com/dnUu2d.jpg

[XBEY]

http://im87.gulfup.com/CW241j.jpg (http://www.gulfup.com/?RJNyZf)
http://im51.gulfup.com/v1R9Yp.jpg (http://www.gulfup.com/?9yBeiP)

[nadal nadir]

lnx (1-1/x)=lnx-ln(x)/x
si x>=1
ln x >=0 et (1-1/x) >=1
donc
(1)...........0<(lnx-ln(x)/x)

si 0<x<1
ln x <0 et (1-1/x) <0
donc
(2).............0<(lnx-ln(x)/x)

(2) + (1)
+* Pour chacun X à partir de R
0<(lnx-ln(x)/x)

[mouaffak]

marciiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii