x+5/2009 + x+4/2010 = x+3/2011 + x+2/2012
=> 1 + x+5/2009 + 1 + x+4/2000 = 1 + x+3/2011 + 1 + x+2/2012
=> x+2014/2009 + x+2014/2000 = x+2004/2011 + x+2014/2012
=> x+2014/2009 + x+2014/2000 - x+2014/2011 - x+2014/2012 = 0
=> (x+2014).(1/2009 + 1/2010 - 1/2011 - 1/2012) = 0
Do 1/2009 > 1/2011; 1/2010 > 1/2012
=> 1/2009 + 1/2010 - 1/2011 - 1/2012 khác 0
=> x + 2014 = 0
=> x = -2014
tim x biết x+2 / 2012 + x+3 / 2011 = x+4 / 2010 + x+5 / 2009
Tìm x:
x . (1/2+1/3+1/4+. . .+1/2011+1/2012)
2012/1+2011/2+2010/3+2009/4+ . . . +2/2011+1/2012
=1
tim x biet
x + 4/2009 + x + 3 / 2010 = x + 2/2011 + x + 1/2012
( 2009/2010 + 2010/2011 + 2011/2012 ) x ( 1/3 - 1/4 - 1/12 )
Tim x:
x . (1/2+1/3+1/4+. . .+1/2011+1/2012)
2012/1 +2011/2+2010/3+2009/4+2/2011+1/2012
=1
tìm x biết
\(\frac{x+2}{2012}+\frac{x+3}{2011}+\frac{x+4}{2010}+\frac{x+5}{2009}\)
Tìm x biết \(\frac{x+2}{2012}+\frac{x+3}{2011}=\frac{x+4}{2010}+\frac{x+5}{2009}\)
Cac bạn ơi giúp mình vs nha
x+4/2009 =x+3/2010=x+2/2011=x+1/2012
Tìm x
bài 3
a,tìm x,y biết : số 1996xy chia hết cho 2,5,9
b,so sánh
A= 2009/2010 + 2010/2011 + 2011/2012 + 2012/2009 va 4
