tim x biet
x + 4/2009 + x + 3 / 2010 = x + 2/2011 + x + 1/2012
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
X+5/2009+x+4/2010=x+3/2011+x+2/2012
tìm x biết
\(\frac{x+2}{2012}+\frac{x+3}{2011}+\frac{x+4}{2010}+\frac{x+5}{2009}\)
Tìm x biết \(\frac{x+2}{2012}+\frac{x+3}{2011}=\frac{x+4}{2010}+\frac{x+5}{2009}\)
tim x la so nguyen: (5^2011+5^2010+5^2009+...+5^2+5^1+5^0).|1-x|=(-5)^2012-1
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
( 2009/2010 + 2010/2011 + 2011/2012 ) x ( 1/3 - 1/4 - 1/12 )
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
